GEMSTONE AND METHODS OF CUTTING THE SAME

TECHNICAL FIELD

The present disclosure relates to gemstones, more specifically, the present disclosure relates to a pattern of facets of gemstones.

BACKGROUND

Some gemstones are designed/cut to produce a desirable amount of “brilliance” or “sparkle” by forming or cutting a number of individual facets on the exterior surface of the gemstone. Other gemstones are designed/cut to enhance a natural color (e.g., yellow, pink, etc.) of the gemstone. However, it can be difficult to produce a gemstone having a layout of facets at specific angles that produce both a desirable amount of brilliance and also enhance the natural color of the gemstone.

This is particularly apparent when dealing with gemstones that have a fancy (e.g., non-circular) shape. For instance, conventional fancy shape gemstones tend to suffer from increased shadowing which ultimately reduces the sparkle and/or brilliance that each gemstone can achieve. In fact, conventional fancy shape gemstones have been unable to avoid this shadowing which has a negative impact on the sparkle and brilliance of the resulting gemstone. The present disclosure is directed to solving these problems and addressing other needs.

SUMMARY

According to some implementations of the present disclosure, a gemstone includes a girdle, a crown, and a pavilion. The girdle defines a perimeter of the gemstone and has an elliptical-shaped cross-section. The elliptical-shaped cross-section is a generally oval shape with a first pointed end and a second pointed end opposing the first pointed end. The crown forms an upper portion of the gemstone. A surface of the crown includes a table, a plurality of star facets, a plurality of upper intermediate crown facts, a plurality of lower intermediate crown facets, a plurality of main crown facets, and a plurality of upper girdle facets. The table forms a generally horizontal upper surface of the crown. Each of the plurality of star facets is disposed adjacent to and abuts an edge of the table. Each of the plurality of upper intermediate crown facets is disposed generally between two of the plurality of star facets. An upper vertex of each of the plurality of upper intermediate crown facets abuts a vertex of the table. Each of the plurality of lower intermediate crown facets is disposed generally between two of the plurality of upper intermediate crown facets. An upper vertex of each of the plurality of lower intermediate crown facets abuts a lower vertex of one of the plurality of star facets. Each of the plurality of main crown facets is disposed generally between two of the plurality of lower intermediate crown facets. An upper vertex of each of the plurality of main crown facets abuts a lower vertex of one of the plurality of lower intermediate crown facets. The plurality of upper girdle facets is formed in pairs of adjacent upper girdle facets. Each pair of adjacent upper girdle facets is disposed generally between two of the plurality of main crown facets. The upper vertices of both upper girdle facets in each pair of upper girdle facets abuts a lower vertex of one of the plurality of lower intermediate crown facets. A surface of the pavilion includes a plurality of culet-adjacent facets, a plurality of candle facets, a plurality of main pavilion facets, and a plurality of lower girdle facets. The plurality of culet-adjacent facets forms a lower point of the pavilion. A lower portion of each of the plurality of candle facets is disposed generally between two of the plurality of culet-adjacent facets. Each of the main pavilion facets is disposed between two of the plurality of candle facets. A lower edge of each of the plurality of main pavilion facets abuts an upper edge of one of the plurality of culet-adjacent facets. The plurality of lower girdle facets is formed in pairs of adjacent lower girdle facets. Each pair of adjacent lower girdle facets is disposed generally between two of the plurality of main pavilion facets. Each pair of adjacent lower girdle facets has an upper portion of a respective one of the plurality of candle facets disposed generally therebetween. The girdle is positioned between the crown and the pavilion. Each of the plurality of upper girdle facets is disposed adjacent to and abuts an upper edge of the girdle. Each of the plurality of lower girdle facets is disposed adjacent to and abuts a lower edge of the girdle.

According to some implementations of the present disclosure, a gemstone includes a girdle and a crown. The girdle defines a perimeter of the gemstone and has an elliptical-shaped cross-section. A surface of the crown includes a table, a plurality of star facets, a plurality of upper intermediate crown facts, a plurality of lower intermediate crown facets, a plurality of main crown facets, and a plurality of upper girdle facets. The table forms a generally horizontal upper surface of the crown. Each of the plurality of star facets is disposed adjacent to and abuts an edge of the table. Each of the plurality of upper intermediate crown facets is disposed generally between two of the plurality of star facets. An upper vertex of each of the plurality of upper intermediate crown facets abuts a vertex of the table. Each of the plurality of lower intermediate crown facets is disposed generally between two of the plurality of upper intermediate crown facets. An upper vertex of each of the plurality of lower intermediate crown facets abuts a lower vertex of one of the plurality of star facets. Each of the plurality of main crown facets is disposed generally between two of the plurality of lower intermediate crown facets. An upper vertex of each of the plurality of main crown facets abuts a lower vertex of one of the plurality of lower intermediate crown facets. The plurality of upper girdle facets is formed in pairs of adjacent upper girdle facets. Each pair of adjacent upper girdle facets is disposed generally between two of the plurality of main crown facets. The upper vertices of both upper girdle facets in each pair of upper girdle facets abuts a lower vertex of one of the plurality of lower intermediate crown facets.

According to some implementations of the present disclosure, a gemstone includes a girdle and a pavilion. The girdle defines a perimeter of the gemstone and has an elliptical-shaped cross-section. A surface of the pavilion includes a plurality of culet-adjacent facets, a plurality of candle facets, a plurality of main pavilion facets, and a plurality of lower girdle facets. The plurality of culet-adjacent facets forms a lower point of the pavilion. A lower portion of each of the plurality of candle facets is disposed generally between two of the plurality of culet-adjacent facets. Each of the main pavilion facets is disposed between two of the plurality of candle facets. A lower edge of each of the plurality of main pavilion facets abuts an upper edge of one of the plurality of culet-adjacent facets. The plurality of lower girdle facets is formed in pairs of adjacent lower girdle facets. Each pair of adjacent lower girdle facets is disposed generally between two of the plurality of main pavilion facets. Each pair of adjacent lower girdle facets has an upper portion of a respective one of the plurality of candle facets disposed generally therebetween.

According to some implementations of the present disclosure, a gemstone includes a girdle, a crown, and a pavilion. The girdle defines a perimeter of the gemstone and has an elliptical-shaped cross-section. A surface of the crown includes a table, a plurality of star facets, a plurality of upper intermediate crown facts, a plurality of lower intermediate crown facets, a plurality of main crown facets, and a plurality of upper girdle facets. The table has a generally octagonal shape. The plurality of star facets is disposed adjacent to the table. Each of the plurality of star facets is triangle-shaped. The plurality of upper intermediate crown facets is disposed adjacent to the plurality of star facets. Each of the plurality of upper intermediate crown facets is kite-shaped. The plurality of lower intermediate crown facets is disposed adjacent to the plurality of upper intermediate crown facets. Each of the plurality of lower intermediate crown facets is kite-shaped. The plurality of main crown facets is disposed adjacent to the plurality of lower intermediate crown facets. Each of the plurality of main crown facets is kite-shaped. The plurality of upper girdle facets is disposed adjacent to the plurality of main crown facets. Each of the plurality of upper girdle facets is triangle-shaped. A surface of the pavilion includes a plurality of culet-adjacent facets, a plurality of candle facets, a plurality of main pavilion facets, and a plurality of lower girdle facets. The plurality of culet-adjacent facets forms a lower point of the pavilion. Each of the plurality of culet-adjacent facets has a generally pentagonal shape. The plurality of candle facets is disposed adjacent to the plurality of culet-adjacent facets. Each of the plurality of candle facets has six edges. Each of the main pavilion facets is disposed between two of the plurality of candle facets and has a generally pentagonal shape. The plurality of lower girdle facets is formed in pairs of adjacent lower girdle facets. Each pair of adjacent lower girdle facets is disposed generally between two of the plurality of main pavilion facets. Each lower girdle facet has four edges. The girdle is positioned between the crown and the pavilion. Each of the plurality of upper girdle facets is disposed adjacent to and abuts an upper edge of the girdle. Each of the plurality of lower girdle facets is disposed adjacent to and abuts a lower edge of the girdle.

According to some implementations of the present disclosure, a gemstone includes a crown, a pavilion, and a girdle. The crown forms an upper portion of the gemstone. The pavilion forms a lower portion of the gemstone. The girdle is positioned between the crown and the pavilion, and encircles the gemstone. The girdle has an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end. The gemstone has a top depth percentage between about 22 percent (%) and about 35 percent, and a bottom depth percentage between about 45 percent and about 52 percent.

According to some implementations of the present disclosure, a gemstone includes a crown, a pavilion, and a girdle. The crown forms an upper portion of the gemstone. The pavilion forms a lower portion of the gemstone. The girdle is positioned between the crown and the pavilion, and encircles the gemstone. The girdle has an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end. The gemstone has a total depth percentage between about 76 percent and about 86.5 percent.

According to some implementations of the present disclosure, a gemstone includes a crown forming an upper portion of the gemstone and a pavilion forming a lower portion of the gemstone. The surface of the crown is defined by a first plurality of facets, each of the first plurality of facets being disposed at an angle between about 6° and about 60° relative to an upper surface of the gemstone. The surface of the pavilion is defined by a second plurality of facets, each of the second plurality of facets being disposed at an angle between about 23° and about 50° relative to the upper surface of the gemstone.

According to some implementations of the present disclosure, a gemstone includes a crown, a pavilion, and a girdle. The crown forms an upper portion of the gemstone. The pavilion forms a lower portion of the gemstone. The girdle is positioned between the crown and the pavilion, and encircles the gemstone. The girdle has an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end. The gemstone has a table percentage between about 20 percent and about 34 percent, and a girdle thickness percentage between about 5 percent and about 15 percent.

According to some implementations of the present disclosure, a method of forming a crown of a gemstone includes cutting a generally horizontal upper surface on an upper portion of the gemstone; cutting a first temporary set of crown facets, the first temporary set of crown facets being formed at an angle of between about 28° and about 50° relative to the generally horizontal upper surface. The method also includes cutting a second temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the first temporary set of crown facets, the second temporary set of crown facets being formed at an angle of between about 20° and about 36° relative to the generally horizontal upper surface, a remainder of the first temporary set of crown facets forming a third temporary set of crown facets; cutting a fourth temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the second temporary set of crown facets, the fourth temporary set of crown facets being formed at an angle of between about 8° and about 25° relative to the generally horizontal upper surface, a remainder of the second temporary set of crown facets forming a first final set of crown facets; cutting a second final set of crown facets on the upper portion of the gemstone from portions of the third temporary set of crown facets, the second final set of crown facets being formed at an angle of between about 48° and about 60° relative to the generally horizontal upper surface, a remainder of the third temporary set of crown facets forming a third final set of crown facets; and cutting a fourth final set of crown facets on the upper portion of the gemstone from portions of the generally horizontal surface and the fourth temporary set of crown facets, the fifth final set of crown facets being formed at an angle of between about 6° and about 18° relative to the generally horizontal upper surface, a remainder of the fourth temporary set of crown facets forming a fifth final set of crown facets, such that the upper portion of the gemstone is formed from the first, second, third, fourth, and fifth final sets of crown facets.

According to some implementations of the present disclosure, a method of forming a pavilion of a gemstone includes cutting a first temporary set of pavilion facets, the first temporary set of pavilion facets being formed at an angle of between about 25° and about 48° relative to the horizontal upper surface, the first temporary set of facets forming a lower point; cutting a second temporary set of pavilion facets on the lower portion of the gemstone from portions of the first temporary set of pavilion facets, the second temporary set of facets being formed at an angle of between about 23° and about 40° relative to the horizontal upper surface, a remainder of the first temporary set of pavilion facets forming a third temporary set of pavilion facets; cutting a fourth temporary set of pavilion facets on the lower portion of the gemstone from portions of the second temporary set of pavilion facets and the third temporary set of pavilion facets, the fourth temporary pavilion facets being formed at an angle of between about 25° and about 44° relative to the horizontal upper surface, a remainder of the second temporary set of pavilion facets forming a first final set of pavilion facets, a remainder of the third temporary set of pavilion facets forming a fifth temporary set of pavilion facets; and cutting a second final set of pavilion facets on the lower portion of the gemstone from portions of the fourth temporary set of pavilion facets and the fifth temporary set of pavilion facets, the second final set of pavilion facets being formed at an angle of between about 36° and about 50°, a remainder of the fourth temporary set of pavilion facets forming a third final set of pavilion facets, a remainder of the fifth temporary set of pavilion facets forming a fourth final set of pavilion facets, such that the lower portion of the gemstone is formed from the first, second, third, and fourth final sets of pavilion facets.

According to still other implementations of the present disclosure, a method of forming a gemstone having a crown, a girdle, and a pavilion may be implemented. The method includes creating the crown of the gemstone, by cutting a generally horizontal upper surface on an upper portion of the gemstone; cutting a first temporary set of crown facets, the first temporary set of crown facets being formed at an angle of between about 28° and about 50° relative to the generally horizontal upper surface. Creating the crown of the gemstone also includes cutting a second temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the first temporary set of crown facets, the second temporary set of crown facets being formed at an angle of between about 20° and about 36° relative to the generally horizontal upper surface, a remainder of the first temporary set of crown facets forming a third temporary set of crown facets; cutting a fourth temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the second temporary set of crown facets, the fourth temporary set of crown facets being formed at an angle of between about 8° and about 25° relative to the generally horizontal upper surface, a remainder of the second temporary set of crown facets forming a first final set of crown facets; cutting a second final set of crown facets on the upper portion of the gemstone from portions of the third temporary set of crown facets, the second final set of crown facets being formed at an angle of between about 48° and about 60° relative to the generally horizontal upper surface, a remainder of the third temporary set of crown facets forming a third final set of crown facets; and cutting a fourth final set of crown facets on the upper portion of the gemstone from portions of the generally horizontal surface and the fourth temporary set of crown facets, the fifth final set of crown facets being formed at an angle of between about 6° and about 18° relative to the generally horizontal upper surface, a remainder of the fourth temporary set of crown facets forming a fifth final set of crown facets, such that the upper portion of the gemstone is formed from the first, second, third, fourth, and fifth final sets of crown facets. The method further includes creating the pavilion of the gemstone, by cutting a first temporary set of pavilion facets, the first temporary set of pavilion facets being formed at an angle of between about 25° and about 48° relative to the horizontal upper surface, the first temporary set of facets forming a lower point; cutting a second temporary set of pavilion facets on the lower portion of the gemstone from portions of the first temporary set of pavilion facets, the second temporary set of facets being formed at an angle of between about 23° and about 40° relative to the horizontal upper surface, a remainder of the first temporary set of pavilion facets forming a third temporary set of pavilion facets; cutting a fourth temporary set of pavilion facets on the lower portion of the gemstone from portions of the second temporary set of pavilion facets and the third temporary set of pavilion facets, the fourth temporary pavilion facets being formed at an angle of between about 25° and about 44° relative to the horizontal upper surface, a remainder of the second temporary set of pavilion facets forming a first final set of pavilion facets, a remainder of the third temporary set of pavilion facets forming a fifth temporary set of pavilion facets; and cutting a second final set of pavilion facets on the lower portion of the gemstone from portions of the fourth temporary set of pavilion facets and the fifth temporary set of pavilion facets, the second final set of pavilion facets being formed at an angle of between about 36° and about 50°, a remainder of the fourth temporary set of pavilion facets forming a third final set of pavilion facets, a remainder of the fifth temporary set of pavilion facets forming a fourth final set of pavilion facets, such that the lower portion of the gemstone is formed from the first, second, third, and fourth final sets of pavilion facets. Further still, the method includes creating the girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end. Creating the girdle may include forming (e.g., cutting) the girdle according to any of the implementations included herein.

The foregoing and additional aspects and implementations of the present disclosure will be apparent to those of ordinary skill in the art in view of the detailed description of various embodiments and/or implementations, which is made with reference to the drawings, a brief description of which is provided next.

BRIEF DESCRIPTION OF THE DRAWINGS

The foregoing and other advantages of the present disclosure will become apparent upon reading the following detailed description and upon reference to the drawings.

FIG. 1A is a first elevation view of a gemstone along a major axis, according to some implementations of the present disclosure;

FIG. 1B is a second elevation view of the gemstone of FIG. 1A along a minor axis, according to some implementation of the present disclosure;

FIG. 2 is a top plan view of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 3 is a bottom plan view of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 4A is a perspective view of the gemstone of FIGS. 1A and 1B viewed at a downward angle, according to some implementations of the present disclosure;

FIG. 4B is a perspective view of the gemstone of FIGS. 1A and 1B viewed at an upward angle, according to some implementations of the present disclosure;

FIG. 5A illustrates a first step of a method of forming a crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 5B illustrates a second step of the method of forming the crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 5C illustrates a third step of the method of forming the crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 5D illustrates a fourth step of the method of forming the crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 5E illustrates a fifth step of the method of forming the crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 5F illustrates a sixth step of the method of forming the crown of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 6A illustrates a first step of a method of forming a pavilion of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 6B illustrates a second step of the method of forming the pavilion of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure;

FIG. 6C illustrates a third step of the method of forming the pavilion of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure; and

FIG. 6D illustrates a fourth step of the method of forming the pavilion of the gemstone of FIGS. 1A and 1B, according to some implementations of the present disclosure.

While the present disclosure is susceptible to various modifications and alternative forms, specific implementations and embodiments have been shown by way of example in the drawings and will be described in detail herein. It should be understood, however, that the present disclosure is not intended to be limited to the particular forms disclosed. Rather, the present disclosure is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.

DETAILED DESCRIPTION

FIGS. 1A and 1B illustrate elevation views of an implementation of the gemstone 1. The gemstone 1 is generally divided into a crown 10 formed as the upper portion of the gemstone 1, a pavilion 30 formed as the lower portion of the gemstone 1, and a girdle 50, which is generally disposed between the crown 10 and the pavilion 30. The girdle 50 generally encircles the entire circumference of the gemstone 1. The crown 10 generally has a flat top surface (as seen in FIG. 2), referred to as a table 12. The lower portion of the gemstone 1 at the pavilion 30 can terminate in a lower point as shown in FIGS. 1A and 1B, or can terminate in a flat facet called a culet. The gemstone 1 is generally a precious stone, such as but not limited to a diamond, ruby, emerald, sapphire, or pearl. The gemstone 1 can also be a synthetic material, such as cubic zirconium. More broadly, the gemstone 1 can include any material capable of being cut, such as, for example, precious or non-precious stones, cubic zirconia, ceramic, metal, plastic, wood, etc.

The girdle 50 is generally the widest portion of the gemstone 1. When the gemstone 1 is viewed from above or below (e.g., the view in FIGS. 2 and 3, respectively), the girdle 50 defines the outer perimeter of the gemstone 1. The gemstone 1 has an elliptical shape. The elliptical shape is generally an oval shape with two opposing ends that form a first pointed end and a second pointed end on opposite sides of the gemstone 1, e.g., as shown. The shape, size, profile, etc. of the first and/or second pointed ends depicted in FIGS. 1A-1B are in no way intended to limit the invention, and may be adjusted as desired. Moreover, the first and second pointed ends may have a same (e.g., substantially similar) profile in some implementations, while in other implementations the first and second pointed ends may be somewhat similar, different, etc. Thus, the girdle 50 and the perimeter of the gemstone 1 have an elliptical-shaped cross-section, which generally has two pointed ends. As shown in FIGS. 2 and 3, the tapered ends can terminate in a point.

The cross-section of the girdle 50 and the gemstone 1 has a major axis A1 and a minor axis A₂that are generally perpendicular to each other. The major axis A1 extends between the two pointed ends. The minor axis A₂extends between opposite sides of the gemstone 1. The dimension of the gemstone 1 along the major axis A1 is larger than the dimension of the gemstone 1 along the minor axis A₂. In other words, the gemstone 1 has a larger length as measured along the major axis A₁than a shorter length measured along the minor axis A₂. In some implementations, the ratio of the dimension along the major axis A₁to the dimension along the minor axis A₂is about 1.55 to 2.10. In another implementation, the ratio is about 1.2 to about 1.9. In still other implementations, the ratio is greater than 1.0 and less than or equal to 1.7, greater than 1.0 and less than or equal to 1.5, greater than 1.0 and less than or equal to 1.3. In further implementations, the ratio is about 1.17, but could be higher or lower depending on the particular implementation.

Viewing FIG. 1A, the major axis A₁extends horizontally relative to the plane of FIG. 1A, while the minor axis A₂(not shown) extends into and out of the plane of FIG. 1A. Viewing FIG. 1B, the minor axis A₂extends horizontally relative to the plane of FIG. 1B, while the major axis A₁(not shown) extends into and out of the plane of FIG. 1B. Generally, the gemstone 1 is symmetric about the major axis A₁, and is also symmetric about the minor axis A₂.

In other implementations, the gemstone 1 can have a shape that differs from the shape shown in FIGS. 1A and 1B. For example, in some implementations, the gemstone 1 can have generally different dimension along the major and minor axes A₁and A₂, while remaining symmetric about the major axis A₁and minor axis A₂. In additional or alternative implementations, the first and or second pointed ends do not taper to a point, but instead taper to a slightly rounded end or a flat end. Generally, if end 2A tapers to a rounded end, end 2A will have a similar radius of curvature as end 2B, but they may be different. As shown in FIGS. 2 and 3, the distance of the gemstone 1 along the minor axis A₂is about the same at each point along the major axis A₁.

The dimensional characteristics of the gemstone 1 are based off of the width of the gemstone 1. The width of the gemstone 1 is the distance between the sides of the gemstone 1 at the girdle. In these implementations, the width of the gemstone 1 is the dimension of the gemstone 1 along the minor axis A₂, at the girdle 50. In other implementations, the other measurements of the gemstone 1 could also be defined as the “width” of the gemstone 1, to determine the dimensional characteristics of the gemstone 1. It follows that the specific names and/or dimensions included herein are in no way intended to be limiting.

The gemstone 1 has a table percentage that is a measure of a width or diameter of the table of the gemstone 1. The table can be formed in a variety of shapes, as thus the measure of the width of the table can vary. In an implementation, the table is a circle, and thus the diameter of the circle is used to express the table percentage of the gemstone 1. In another implementation, the table is an octagon, and either the distance between opposing edges of the octagon or between opposing vertices of the octagon is used to express the table percentage. The table percentage is generally expressed as the width of the table 12 divided by the width of the gemstone 1. In an implementation, the table percentage is between about 28 percent and about 36 percent. In other implementations, the table percentage may be between about 25 percent and about 38 percent. In still other implementations, the table percentage may be between about 20 percent and about 45 percent. In yet a further implementation the table percentage is about 33.5 percent. In another implementation, the table percentage is between about 20 percent and about 34 percent. In another implementation, the table percentage is between about 30 percent and about 34 percent.

The gemstone 1 has a top depth percentage that is a measure of the height of the crown 10 of the gemstone 1. The top depth percentage is generally expressed as the height of the crown 10 divided by the width of the gemstone 1. In some implementations, the top depth percentage is between about 24.5 percent and about 28.5 percent. In other implementations, the top depth percentage is between about 20 percent and about 30 percent. In a further implementation, the top depth percentage is between about 15 percent and about 35 percent. In yet a further implementation the top depth percentage is about 25.5 percent.

The gemstone 1 has a bottom depth percentage that is a measure of the total height of the pavilion 30 of the gemstone 1. The bottom depth percentage is generally expressed as the height of the pavilion 30 divided by the width of the gemstone 1. In some implementations, the bottom depth percentage is between about 43.5 percent and about 47 percent. In other implementations, the bottom depth percentage is between about 40 percent and about 50 percent. In a further implementation the bottom depth percentage is between about 35 percent and about 60 percent. In still another implementation, the bottom depth percentage is about 48.5 percent. In a further implementation, the bottom depth percentage is between about 35 percent and about 40 percent. In another implementation, the bottom depth percentage is greater than or equal to 35 percent and less than 40 percent.

The gemstone 1 has a girdle thickness percentage that is a measure of the total height of the girdle 50 of the gemstone 1. The girdle thickness percentage is generally expressed as the height of the girdle 50 divided by the width of the gemstone 1. In an implementation, the girdle thickness percentage is between about 4 percent and about 9 percent. In some implementations, the girdle thickness percentage is between about 2 percent and about 10 percent. In other implementations, the girdle thickness percentage is greater than about 0 percent and less than about 15 percent. In yet a further implementation the girdle thickness percentage is about 5.0 percent. In a further implementation, the girdle thickness percentage is between about 5 percent and about 15 percent. In another implementation, the girdle thickness percentage is between about 5 percent and about 10 percent. In still another implementation, the girdle thickness percentage is between about 10 percent and about 15 percent.

The gemstone 1 has a total depth percentage that is a measure of the total height of the gemstone 1. The total depth percentage is generally expressed as the height of the gemstone 1 divided by the width of the gemstone 1. The total depth percentage may also be expressed as the sum of the top depth percentage, the bottom depth percentage, and the girdle thickness percentage. In an implementation, the total depth percentage is between about 76 percent and about 86.5 percent. In some implementations, the total depth percentage is between about 70 percent and about 88 percent. In other implementations, the total depth percentage is between about 65 percent and about 90 percent. In a further implementation the total depth percentage is about 88.5 percent. In an even further implementation, the total depth percentage is about 81 percent. In a further implementation, the total depth percentage is between about 85 percent and about 95 percent. In another implementation, the total depth percentage is between about 85 percent and about 90 percent. In still another implementation, the total depth percentage is greater than 85 percent and less than or equal to 90 percent.

The surface of the gemstone 1 is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The facets comprising the surface of the crown 10 generally include a table 12; star facets 14A, 14B; upper intermediate crown facets 16A, 16B, 16C; lower intermediate crown facets 18A, 18B; main crown facets 20A, 20B, 20C; and upper girdle facets 22A, 22B. The upper girdle facets 22A-22B generally abut an upper edge of the girdle 50.

The groups of facets comprising the surface of the pavilion 30 include culet-adjacent facets 32A, 32B, 32C; candle facets 34A, 34B; main pavilion facets 36A, 36B, 36C; and lower girdle facets 38A, 38B. As noted above, the lower girdle facets 38A-38B generally abut a lower edge of the girdle 50. Accordingly, the general shape of the upper and lower edges of the girdle 50 may impact the general shape of the lower girdle facets 38A-38B. For example, the upper and/or lower edges of the girdle 50 may be curved in some implementations (e.g., see FIGS. 1A-1B), thereby causing a lower edge of the upper girdle facets 22A, 22B to be curved as well. It follows that in other implementations the upper and/or lower edges of the girdle 50 may be straight, parallel to each other, angled, jagged, etc. Similarly, the lower edge of the upper girdle facets 22A, 22B may have a design that corresponds to that of the girdle 50, e.g., as would be appreciated by one skilled in the art after reading the present description.

In some implementations, the girdle 50 is a continuous elliptical-shaped facet that encircles the entirety of the gemstone 1. Thus, in these implementations, the cross-section of the girdle 50 is a generally continuous curve that tapers towards both pointed ends. In other implementations, the girdle 50 is divided into a plurality of sub-facets. In yet other implementations, each sub-facet of the girdle 50 comprises a plurality of individual facets. As shown in FIGS. 1A and 1B, the upper edge of the girdle 50 that abuts the crown 10 may be generally straight or may be curved, when viewed from the side. Similarly, the lower edge of the girdle 50 that abuts the pavilion 30 may be generally straight or may be curved, when viewed from the side. It follows that an edge of the upper girdle facets.

The angles that each of the facets of the crown 10 are disposed at may be measured relative to a horizontal plane defined by the table of the gemstone 1 (e.g., the top surface of the gemstone 1). As shown in the upper set of axes in FIGS. 1A and 1B, each of the facets of the crown 10 is formed at an angle θ_Crelative to the horizontal plane defined by the table of the gemstone 1. As is shown in FIGS. 1A and 1B, the angle θ_Cthat each of the facets of the crown 10 are disposed at is formed by rotating downward from the horizontal plane defined by the table.

Generally, every facet within a group of facets is disposed at the same angle or at an angle within the same range, and has a generally identical shape. For example, each of the main crown facets 20B is disposed at the same angle or at an angle within the same range as the other main crown facets 20B, and also has the same shape as the other main crown facets 20B. Similarly, each of the main crown facets 20C is disposed at the same angle or at an angle within the same range as the other main crown facets 20C, and also has the same shape as the other main crown facets 20C.

In some implementations, two different groups of facets can have different shapes, but the range of angles for the two groups of facets can overlap or can be the same, such that two facets within the two groups of facets may have identical or substantially identical angles, but different shapes. In some implementations, two different groups of facets can be disposed at different angles or at angles within different ranges, but can have generally identical shapes.

As referred to herein, the various facets are generally sorted into groups of facets based on their position on the crown 10 or the pavilion 30. Different groups of facets sharing a common name generally have the same position on the crown 10 or the pavilion 30, and have similar shapes. However, as is discussed in more detail below, due to the cross-sectional shape of the gemstone 1 (e.g., elliptical-shaped), different groups of facets sharing a common name may generally have slightly different shapes. For example, all of the main crown facets (including the main crown facets 20A, 20B, and 20C) are positioned generally between lower intermediate crown facets and upper girdle facets, and are all generally kite-shaped. However, the kite shape of the main crown facets 20A can be different than the kite shape of the main crown facets 20B.

In an implementation, the angle of each of the star facets 14A, 14B is between about 6° and about 18°. In some implementations, the angle of each of the star facets 14A, 14B is between about 3° and about 20°. In other implementations, the angle of each of the star facets 14A, 14B is about 13°, but could be higher or lower.

In an implementation, the angle of each of the upper intermediate crown facets 16A, 16B, and 16C between about 8° and about 25°. In some implementations, the angle of each of the upper intermediate crown facets 16A, 16B, and 16C is between about 8° and about 30°. In other implementations, the angle of each of the upper intermediate crown facets 16A, 16B, and 16C is between about 17° and about 25°. In yet another implementation, the angle of each of the upper intermediate crown facets 16A, 16B, and 16C is about 19.5°, but could be higher or lower.

In an implementation, the angle of each of the lower intermediate crown facets 18A, 18B is between about 20° and about 36°. In some implementations, the angle of each of the lower intermediate crown facets 18A, 18B is between about 15° and about 40°. In other implementations, the angle of each of the lower intermediate crown facets 18A, 18B is between about 28° and about 36°. In yet another further implementation, the angle of each of the lower intermediate crown facets 18A, 18B is about 30°, but could be higher or lower.

In some implementations, the angle of each of the main crown facets 20A, 20B, 20C is between about 28° and about 48°. In other implementations, the angle of each of the main crown facets 20A, 20B, 20C is between about 25° and about 50°. In still other implementations, the angle of each of the main crown facets 20A, 20B, 20C is between about 35° and about 55°. In still further implementations, the angle of each of the main crown facets 20A, 20B, 20C is between about 39° an about 48°, between about 43° and about 50°, between about 28° and about 36°, and/or combinations thereof.

In an implementation, the angle of each of the upper girdle facets 22A, 22B is between about 48° and about 60°. In a further implementation, the angle of each of the upper girdle facets 22A, 22B is between about 43° and about 60°. In other implementations, the angle of each of the upper girdle facets 22A, 22B may be between about 40° and about 54°. In a further implementation, the angle of each of the upper girdle facets 22A, 22B may be about 52°.

The angles that each of the facets of the pavilion 30 are disposed at may also be measured relative to the horizontal plane defined by the table 12 of the gemstone 1 (e.g., the top surface of the gemstone 1). As shown in the lower set of axes in FIGS. 1A and 1B, each of the facets of the pavilion 30 is formed at an angle θ_Prelative to this horizontal plane defined by the table 12 of the gemstone 1. As is shown in FIGS. 1A and 1B, the angle θ_Pthat each of the facets of the pavilion 30 are disposed at is formed by rotating downward from the horizontal plane defined by the table 12.

In some implementations, the angle of each of the culet-adjacent facets 32A-32C is between about 23° and about 29°. In other implementations, the angle of each of the culet-adjacent facets 32A-32C is between about 20° and about 33°. In still other implementations, the angle of each of the culet-adjacent facets 32A-32C is between about 16° and about 40°. In other implementations, the angle of each of the culet-adjacent facets 32A-32E is about 28.5°, but could be higher or lower.

In some implementations, the angle of each of the candle facets 34A, 34B is between about 25° and about 44°. In other implementations, the angle of each of the candle facets 34A, 34B is between about 38° and about 44°. In still other implementations, the angle of each of the candle facets 34A, 34B is between about 20° and about 50°. In yet another implementation, the angle of each of the candle facets 34A, 34B is about 36.5°, but could be higher or lower.

In some implementations, the angle of each of main pavilion facets 36A is between about 25° and about 35°. In other implementations, the angle of each of the main pavilion facets 36A is between about 22° and about 40°. In still other implementations, the angle of each of the main pavilion facets 36A is between about 20° and about 43°. In yet another implementation, the angle of each of the main pavilion facets 36A is about 34°, but could be higher or lower.

In some implementations, the angle of each of the main pavilion facets 36B is between about 35° and about 45°. In other implementations, the angle of each of the main pavilion facets 36B is between about 33° and about 48°. In still other implementations, the angle of each of the main pavilion facets 36B is between about 30° and about 50°. In yet another implementation, the angle of each of the main pavilion facets 36A is about 40.5°, but could be higher or lower.

In some implementations, the angle of each of the main pavilion facets 36C is between about 42° and about 48°. In other implementations, the angle of each of the main pavilion facets 36C is between about 40° and about 50°. In still other implementations, the angle of each of the main pavilion facets 36C is between about 35° and about 55°. In yet another implementation, the angle of each of the main pavilion facets 36C is about 46°, but could be higher or lower. It should also be noted that each of the main pavilion facets 36A, 36B, 36C may have different, similar, or the same angles depending on the implementation.

In some implementations, the angle of each of the lower girdle facets 38A, 38B is between about 36° and about 50°. In other implementations, the angle of each of the lower girdle facets 38A, 38B is between about 40° and about 55°. In yet other implementations, the angle of each of the lower girdle facets 38A, 38B is between about 35° and about 60°. In still other implementations, the angle of each of the lower girdle facets 38A, 38B is between about 28° and about 50°. In still a further implementation, the angle of each of the lower girdle facets 38A, 38B is about 48°, but could be higher or lower.

The disclosed gemstones herein having the number, arrangement, size, orientation, etc. of facets are able to achieve and/or produce improved performance of at least brilliance and sparkle in comparison to conventional fancy shape gemstones of corresponding general shapes. Conventional fancy shaped gemstones suffer from increased internal shadowing which ultimately reduces the performance (e.g., brilliance and/or sparkle) such conventional fancy shaped gemstones are able to achieve. For example, conventional gemstones having a tapered elliptical shape with pointed ends (also referred to as a “Marquise shape”) have experienced reduced performance, particularly in comparison to gemstones that do not have a tapered or elongated shape. It follows that while some conventional fancy shaped gemstones may have a similar overall shape (e.g., basic outer profile) as some implementations herein, the performance of these conventional fancy shaped gemstones is significantly lower than what the implementations disclosed herein are able to achieve. With respect to the present description, the “performance” of a gemstone may be associated with different characteristics of the gemstone. These characteristics may be quantified using one or more numbers (e.g., scores). For example, the performance of a gemstone may include one or more numbers quantifying the fire, scintillation, contrast, brightness, any other desired characteristic(s) of the gemstone, or any combination thereof.

It follows that the shadowing present in conventional fancy shape gemstones is significantly undesirable and ultimately reduces the fire and scintillation of the gemstones. As a result, conventional fancy shape gemstones with an elongated fancy shape outer profile are known by those of ordinary skill in the art to suffer from reduced performance, at least in comparison to gemstone designs that are not elongated fancy shapes.

In sharp contrast to these persistent issues that have plagued conventional gemstones, implementations disclosed herein are able to eliminate and/or reduce such internal shadowing. The disclosed implementations herein with the specified combination of facet sizes, orientations, shapes, etc. aid in eliminating and/or reducing the shadowing experienced in conventional fancy shaped gemstones. For example, implementations herein are able to reduce and/or eliminate internal shadowing as well as improve performance of the resulting gemstone by increasing the total depth, top depth, and bottom depth of the gemstone, as well as other details, for example, as described in further detail below.

As mentioned above, the disclosed implementations herein have improved performance by, for example, reducing the size of the table (e.g., see table 12 of FIG. 2 below) and/or, for example, the size of facets directly abutting the table (e.g., see star facets 16A-16C). With respect to the present description, the “size” of a facet is intended to refer to an amount of surface area the respective facet has. However, the size of a facet may be measured using any desired standards and/or metrics. It is noted that decreased size of the table and/or facets directly abutting the table of the present disclosure causes a relatively increased amount of brilliance, sparkle, etc., for the resulting gemstone in comparison to conventional fancy gemstones. For instance, implementing a gemstone having a table and/or facets directly abutting the table that are smaller than conventional products has notably improved performance of the approaches herein. The gemstone may also have a table and/or facets directly abutting the table that are smaller in surface area than some, a majority, at least one, all, etc., of the remaining facets in the gemstone. For example, each of the table 12 and/or star facets 14A, 14B may have a smaller surface area than at least one of the main pavilion facets 36A-36C (see FIGS. 1A-4B).

Although the performance of the gemstone improved as the size of the table decreased, it was also surprising to discover that gemstone performance as measured by at least the brilliance and sparkle of the gemstone can be further improved by ensuring a total surface area of culet facets (e.g., see culet facets 32A-32C of FIGS. 1A-1B) in the pavilion of a gemstone is less than a surface area of the table in the crown. In preferred approaches, the culet facets are small enough to fit inside an outer periphery of the table should the two be overlayed. These preferred approaches further improve the brilliance, sparkle, fire, scintillation, etc. of the resulting gemstone by creating a light reflection in the shape of a flower inside the gemstone. This flower shape is visible through the table of the gemstone and is formed by the reflections of light after entering the gemstone, e.g., as would be appreciated by one skilled in the art after reading the present description. It was previously believed that a flower shaped light reflection was only achievable in a round and symmetric gemstone. This is partially because of the above mentioned internal shadowing that has negatively impacted performance of conventional gemstones. However, by successfully removing and/or reducing this internal shadowing as a result of implementing the various details of the implementations included herein, the flower shaped light reflection is achievable, thereby further improving performance, e.g., such as the brightness and fire of the resulting gemstone.

Performance of the implementations disclosed herein also improves as a width of certain facets in the pavilion decrease (e.g., see pavilion 30 of FIGS. 1A-1B). For instance, performance of a gemstone implementation increases as the width of each candle facet (e.g., see candle facets 34A-34B of FIGS. 1A-1B) decreases. Again, with respect to the present description, the “width” of the candle facet is measured perpendicular to a longitudinal axis of the respective facet. Performance (e.g., brilliance, sparkle, fire, scintillation, etc.) also improves as a result of increasing the total depth percentage of gemstones and increasing the top depth percentage of gemstones.

Referring now to FIG. 2, a top plan view of the gemstone 1 showing the facets forming the crown 10 is illustrated. In describing the facets of the crown 10 shown in FIG. 2, reference is made to the pointed ends 13A, 13B of the crown 10, and the first side 15A and the second side 15B of the crown 10. The ends 13A and 13B of the crown 10 generally correspond to the ends 3A and 3B of the gemstone 1.

The major axis A₁of the perimeter of the gemstone (which is formed by the girdle 50) extends vertically relative to the plane of FIG. 2 (between the first side 15A of the crown 10 and the second side 15B of the crown 10), while the minor axis A₂extends horizontally relative to the plane of FIG. 2 (between the pointed ends). As shown in FIG. 2, the major axis A₁divides the table 12 between a left portion and right portion, and the minor axis A₂divides the table 12 into a top portion and a bottom portion. The minor axis A₂also divides the crown 10 in half between the pointed ends.

The major and minor axes A₁and A₂generally divide the facets of the crown 10 into a first quadrant 11A, a second quadrant 11B, a third quadrant 11C, and fourth quadrant 11D. The first quadrant 11A generally corresponds to the top-right corner region of the crown 10 relative to the plane of FIG. 2. The second quadrant 11B generally corresponds to the top-left corner region of the crown 10 relative to the plane of FIG. 2. The third quadrant 11C generally corresponds to the bottom-left corner region of the crown 10 relative to the plane of FIG. 2. The fourth quadrant 11D generally corresponds to the bottom-right corner region of the crown 10 relative to the plane of FIG. 2.

The terms “top,” “bottom,” “left,” “right,” “above,” below,” etc. are used herein to refer to the locations of the various facets on the crown 10. However, those of skill in the art will understand that these are relative terms that are generally used in reference to the plane of FIG. 2. Thus, any of these terms used to describe an individual facet may not apply when viewing the crown 10 from a different perspective. The facets on the surface of the crown 10 share edges and vertices where the facets meet. When describing the facets on the surface of the crown 10, the term “upper” is used to refer to edges or vertices nearer to the table 12, while the term “lower” is used to refer to edges or vertices nearer to the girdle 50.

The crown 10 includes a number of main crown facets, which include one main crown facet 20A, four main crown facets 20B, and two main crown facets 20C. Each of the main crown facets 20A-20C are generally diamond or kite-shaped, and has an upper vertex, a lower vertex, two lateral vertices, two upper edges, and two lower edges.

Main crown facet 20A is generally split in half by the major axis A₁, and is disposed above the minor axis A₂. Thus, main crown facet 20A is disposed on one of the pointed ends of the crown 10, with about half of its surface area in the first quadrant 11A on the first side 15A of the crown 10, and about half of its surface area in the second quadrant 11B on the second side 15B of the crown 10. The main crown facet 20A is generally positioned between the upper intermediate crown facet 16A, the two lower intermediate crown facets 18A, the two main crown facets 20B, the two pairs of upper girdle facets 22A, and the upper edge of the girdle 50. Generally, both main crown facets 20A are positioned at the same location along the minor axis A₂. The main crown facets 20A are thus disposed along the major axis A₁.

The four main crown facets 20B are disposed above and below the minor axis A₂. A first of the main crown facet 20B is disposed to the right of the major axis A₁, in the first quadrant 11A. A second main crown facet 20B is disposed to the left of the major axis A₁, in the second quadrant 11B. Each main crown facet 20B is generally positioned between one of the upper intermediate crown facets 16B, one of the lower intermediate crown facets 18A, one of the lower intermediate crown facets 18B, the main crown facet 20A, one of the main crown facets 20B, one of the pairs of upper girdle facets 22A, one of the pairs of upper girdle facets 22B, and the upper edge of the girdle 50. Generally, corresponding pairs of the main crown facets 20B are positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and above/below the minor axis A₂.

The two main crown facets 20C are disposed at opposite ends of the minor axis A₂, and are disposed to the left and to the right of the major axis A₁. The main crown facets 20C are disposed such that about half of the surface area of each of the main crown facets 20C is above the minor axis A₂. Thus, a first main crown facet 20C is disposed on the first side 15A of the crown 10, with about half of its surface area in the first quadrant 11A of the crown 10, and about half of its surface area in the fourth quadrant 11D of the crown 10. A second main crown facet 20C is disposed on the second side 15B of the crown 10, with about half of its surface area in the second quadrant 11B of the crown 10, and about half of its surface area in the third quadrant 11C of the crown 10. Each main crown facet 20C is generally positioned between one of the upper intermediate crown facets 16C, the lower intermediate crown facets 18B, the main crown facets 20B, the pairs of upper girdle facets 22B, and the upper edge of the girdle 50. Generally, the two main crown facets 20C are positioned at the same location along the major axis A₁, and are thus disposed along the minor axis A₂.

The upper vertex of the main crown facet 20A abuts a lower vertex of the upper intermediate crown facet 16A, and lateral vertices of the two lower intermediate crown facets 18A. The lower vertex of the main crown facet 20A abuts the upper edge of the girdle 50, and a lower vertex of one of the upper girdle facets 22A from each pair of upper girdle facets 22A. Each lateral vertex of the main crown facet 20A abuts a lower vertex of one of the lower intermediate crown facets 18A, a lateral vertex of one of the first main crown facets 20B, and the upper vertices of each upper girdle facet 22A of an adjacent pair of upper girdle facets 22A. Each upper edge of the main crown facet 20A is shared with a lower edge of one of the lower intermediate crown facets 18A. Each lower edge of the main crown facet 20A is shared with an upper edge of one upper girdle facet 22A of an adjacent pair of upper girdle facets 22A.

The upper vertex of each of the main crown facets 20B abuts a lower vertex of one of the upper intermediate crown facets 16B, a lateral vertex of one of the lower intermediate crown facets 18A, and a lateral vertex of one of the lower intermediate crown facets 18B. The lower vertex of each of the main crown facets 20B abuts the upper edge of the girdle 50, a lower vertex of one of the upper girdle facets 22A of an adjacent pair of upper girdle facets 22A, and a lower vertex of one of the upper girdle facets 22B of an adjacent pair of upper girdle facets 22B. Each lateral vertex of each of the main crown facets 20B abuts a lower vertex of either (i) one of the lower intermediate crown facets 18A or (ii) one of the lower intermediate crown facets 18B, a lateral vertex of (i) the main crown facet 20A or (ii) one of the main crown facets 20C, and the upper vertices of (i) each upper girdle facet 22A of an adjacent pair of upper girdle facets 22A or (ii) each upper girdle facet 22B of an adjacent pair of upper girdle facet 22B. Each upper edge of each of the main crown facets 20B is shared with a lower edge of (i) one of the lower intermediate crown facets 18A or (ii) one of the lower intermediate crown facets 18B. Each lower edge of each of the main crown facets 20B is shared with an upper edge of (i) one of the upper girdle facets 22A of an adjacent pair of upper girdle facets 22A or (ii) one of the upper girdle facets 22B of an adjacent pair of upper girdle facets 22B.

The upper vertex of each of the main crown facets 20C abuts a lower vertex of one of the upper intermediate crown facets 16C, a lateral vertex of one of the lower intermediate crown facets 18B, and a lateral vertex of one of the lower intermediate crown facets 18B. The lower vertex of each of the main crown facets 20C abuts the upper edge of the girdle 50, a lower vertex of the upper girdle facets 22B of an adjacent pair of upper girdle facets 22B. Each lateral vertex of each of the main crown facets 20C abuts a lower vertex of either (i) the lower intermediate crown facets 18B, a lateral vertex of (i) the main crown facets 20B, and the upper vertices of (i) each upper girdle facet 22B of an adjacent pair of upper girdle facets 22B. Each upper edge of each of the main crown facets 20C is shared with a lower edge of (i) one of the lower intermediate crown facets 18B. Each lower edge of each of the main crown facets 20C is shared with an upper edge of (i) one of the upper girdle facets 22B of an adjacent pair of upper girdle facets 22B.

While all of the main crown facets 20A-20C are diamond or kite-shaped, in some implementations their shapes are all slightly different due to the pointed ends of the crown 10. Main crown facets 20A are both generally symmetrical across the major axis A₁. However, some main crown facets may be elongated along the major axis A₁in some implementations, and thus the distance between the upper and lower vertices of a main crown facet may be larger than the distance between the upper and lower vertices of the main crown facet 20A.

The upper and lower vertices of each of the main crown facets 20B are generally shifted away from each other. Thus, the angle bisector of the upper vertex of each one of the main crown facets 20B does not also bisect the angle formed at the lower vertex of the same one of the main crown facets 20B. The upper vertex of each of the main crown facets 20B is generally shifted toward the minor axis A₂. The distance between the upper and lower vertices of the main crown facets 20B is generally larger than the distance between the upper and lower vertices of the main crown facets 20C.

Thus, the shapes of the main crown facets 20A-20C can vary depending on their location along the crown 10. However, in other implementations, any one of the groups of main crown facets 20A-20C can have the same size and shape as any of the other groups of main crown facets 20A-20C.

The crown 10 includes four pairs of upper girdle facets 22A, and four pairs of upper girdle facets 22B. Each of the upper girdle facets 22A-22B has a generally triangular shape with three edges and three vertices. Thus, each pair of upper girdle facets 22A-22B is formed as two triangular-shaped facets sharing one generally straight edge.

The two pairs of upper girdle facets 22A are disposed at either of the pointed ends of the crown 10, on either side the major axis A₁. A first pair of upper girdle facets 22A is disposed to the right of the major axis A₁, in the first quadrant 11A. A second pair of upper girdle facets 22A is disposed to the left of the major axis A₁, in the second quadrant 11B. A third pair of upper girdle facets 22A is also disposed to the left of the major axis A₁, in the third quadrant 11C. Moreover, a fourth pair of upper girdle facets 22A is disposed to the right of the major axis A₁, in the fourth quadrant 11D. Generally, the first and second pairs of upper girdle facets 22A are positioned at the same location along the major axis A₁, while third and fourth pairs of upper girdle facets 22A are positioned at the same location along the major axis A₁. Accordingly, each corresponding pair of upper girdle facets 22A (i.e., pairs of upper girdle facets 22A closest to a same pointed end of the gemstone 1) is disposed along an axis that is parallel to and spaced from the minor axis A₂. Each upper girdle facet 22A in each pair of upper girdle facets 22A is generally positioned between one of the lower intermediate crown facets 18A, the main crown facet 20A, one of the main crown facets 20B, the upper edge of the girdle 50, the other upper girdle facet 22A in the same pair of upper girdle facets 22A, and either (i) an upper girdle facet 22A of an adjacent pair of upper girdle facets 22A, or (ii) an upper girdle facet 22B of an adjacent pair of upper girdle facets 22B.

The four pairs of upper girdle facets 22B are disposed above and below the minor axis A₂, in each quadrant of the crown 10. A first pair of upper girdle facets 22B is disposed to the right of the major axis A₁, in the first quadrant 11A. The first pair of upper girdle facets 22B is positioned between the first pair of upper girdle facets 22A and the opposing half 13B of the gemstone 1 as divided along the minor axis A₂, moving in a clockwise direction along the circumference of the gemstone 1. A second pair of upper girdle facets 22B is disposed to the left of the major axis A₁, in the second quadrant 11B. The second pair of upper girdle facets 22B is positioned between the second pair of upper girdle facets 22A and the opposing half 13B of the gemstone 1, moving in a counter-clockwise direction along the circumference of the gemstone 1.

The third pair of upper girdle facets 22B is disposed to the left of the major axis A₁, in the third quadrant 11C. The third pair of upper girdle facets 22B is positioned between the first pair of upper girdle facets 22A and the opposing half 13A of the gemstone 1 as divided along the minor axis A₂, moving in a clockwise direction along the circumference of the gemstone 1. Moreover, a fourth pair of upper girdle facets 22B is disposed to the right of the major axis A₁, in the fourth quadrant 11D. The fourth pair of upper girdle facets 22B is positioned between the second pair of upper girdle facets 22A and the opposing half 13A of the gemstone 1, moving in a counter-clockwise direction along the circumference of the gemstone 1.

Each upper girdle facet 22B in each pair of upper girdle facets 22B is generally positioned between one of the lower intermediate crown facets 18B, one of the main crown facets 20B, one of the main crown facets 20C, the upper edge of the girdle 50, the other upper girdle facet 22B in the same pair of upper girdle facets 22B, and either (i) an upper girdle facet 22A of an adjacent pair of upper girdle facets 22A, or (ii) an upper girdle facet 22B of an adjacent pair of upper girdle facets 22B.

An upper vertex of each upper girdle facet 22A abuts the lower vertex of one of the lower intermediate crown facets 18A, a lateral vertex of the main crown facet 20A, a lateral vertex of one of the main crown facets 20B, and the upper vertex of the other upper girdle facet 22A in the same pair of upper girdle facets 22A. A first lower vertex of each upper girdle facet 22A abuts the upper edge of the girdle, a lower vertex of either (i) the main crown facet 20A or (ii) one of the main crown facets 20B, and the first lower vertex of either (i) an upper girdle facet 22A of an adjacent pair of upper girdle facets 22A or (ii) an upper girdle facet 22B of an adjacent pair of upper girdle facets 22B. A second lower vertex of each upper girdle facet 22A abuts the upper edge of the girdle, and the second lower vertex of the upper girdle facet 22A in the same pair of upper girdle facets 22A.

A first (lower) edge of each of the upper girdle facets 22A is shared with the upper edge of the girdle 50. This first edge of each of the upper girdle facets 22A can be flat or curved depending on the shape of the girdle 50. Accordingly, the first (lower) edge of the upper girdle facets 22A and the upper edge of the girdle 50 can form any desired shape, e.g., form multiple different flat surfaces, combinations of flat surfaces and curved surfaces, curved surfaces of different radii, etc. It should be noted that the same is true for the first (lower) edge of the upper girdle facets 22B and the upper edge of the girdle 50, e.g., as would be appreciated by one skilled in the art after reading the present description. A second edge of each of the upper girdle facets 22A is shared with a lower edge of (i) the main crown facet 20A or (ii) one of the main crown facets 20B. A third edge of each of the upper girdle facets 22A is shared with the third edge of the other upper girdle facet 22A in the same pair of upper girdle facets 22A.

An upper vertex of each upper girdle facet 22B abuts the lower vertex of one of the lower intermediate crown facets 18B, a lateral vertex of one of the main crown facets 20B, a lateral vertex of one of the main crown facets 20C, and the upper vertex of the other upper girdle facet 22B in the same pair of upper girdle facets 22B. A first lower vertex of each upper girdle facet 22B abuts the upper edge of the girdle, a lower vertex of either (i) one of the main crown facets 20B or (ii) one of the main crown facets 20C, and the first lower vertex of either (i) an upper girdle facet 22A of an adjacent pair of upper girdle facets 22A or (ii) an upper girdle facet 22B of an adjacent pair of upper girdle facets 22B. A second lower vertex of each upper girdle facet 22B abuts the upper edge of the girdle, and the second lower vertex of the upper girdle facet 22B in the same pair of upper girdle facets 22B.

A first (lower) edge of each of the upper girdle facets 22B is shared with the upper edge of the girdle 50. This first edge can be flat or curved depending on the shape of the girdle 50. A second edge of each of the upper girdle facets 22B is shared with a lower edge of (i) one of the main crown facets 20B or (ii) one of the main crown facets 20C. A third edge of each of the upper girdle facets 22B is shared with the third edge of the other upper girdle facet 22B in the same pair of upper girdle facets 22B.

In the illustrated implementation, the length of the lower edges of the upper girdle facets 22A-22B generally increases as the upper girdle facet is closer toward one of the pointed ends of the crown 10. Thus, the combined length of the lower edges of each pair of upper girdle facets 22B is generally greater than the combined length of the lower edges of each pair of upper girdle facets 22A. However, in other implementations, the lower edges of some or all of the upper girdle facets 22A-22B are generally the same length, such that all of the upper girdle facets 22A-22B are the same size.

The crown 10 includes four lower intermediate crown facets 18A, and four lower intermediate crown facets 18B. Each of the lower intermediate crown facets 18A-18B are generally diamond or kite-shaped, and has an upper vertex, a lower vertex, two lateral vertices, two upper edges, and two lower edges.

The pairs of lower intermediate crown facets 18A are disposed towards either of the pointed ends of the crown 10, on either side of the major axis A₁. Accordingly, a first lower intermediate crown facet 18A is disposed to the right of the major axis A₁, in the first quadrant 11A. A second lower intermediate crown facet 18A is disposed to the left of the major axis A₁, in the second quadrant 11B. A third lower intermediate crown facet 18A is disposed to the left of the major axis A₁, in the third quadrant 11C. Furthermore, a fourth lower intermediate crown facet 18A is disposed to the right of the major axis A₁, in the fourth quadrant 11D. Generally, lower intermediate crown facets 18A in corresponding pairs (i.e., pairs closest to a same pointed end of the gemstone 1) are positioned at the same location along the major axis A₁. The lower intermediate crown facets 18A in each pair are thereby disposed along an axis that is parallel to and spaced from the minor axis A₂(i.e., both are spaced from the minor axis A₂by a same amount). Each of the lower intermediate crown facets 18A is generally positioned between one of the star facets 14A, the upper intermediate crown facet 16A, one of the upper intermediate crown facets 16B, the other of the lower intermediate crown facets 18A, one of the lower intermediate crown facets 18B, the main crown facet 20A, one of the main crown facets 20B, and one of the pairs of upper girdle facets 22A.

The two pairs of lower intermediate crown facets 18B are disposed on either side of the minor axis A₂. As shown, a first lower intermediate crown facet 18B is disposed to the right of the major axis A₁, in the first quadrant 11A. The first lower intermediate crown facet 18B is positioned between the first lower intermediate crown facet 18A and the opposing half 13B of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A second lower intermediate crown facet 18B is disposed to the left of the major axis A₁, in the second quadrant 11B. The second lower intermediate crown facet 18B is positioned between the second lower intermediate crown facet 18A and the opposing half 13B of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

Furthermore, a third lower intermediate crown facet 18B is disposed to the left of the major axis A₁, in the third quadrant 11C. The third lower intermediate crown facet 18B is positioned between the first lower intermediate crown facet 18A and the opposing half 13A of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A fourth lower intermediate crown facet 18B is also disposed to the right of the major axis A₁, in the fourth quadrant 11D. The fourth lower intermediate crown facet 18B is positioned between the second lower intermediate crown facet 18A and the opposing half 13A of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

Each of the lower intermediate crown facets 18B is generally positioned between one of the star facets 14B, one of the upper intermediate crown facets 16B, one of the upper intermediate crown facets 16C, one of the lower intermediate crown facets 18A, one of the lower intermediate crown facets 18B, one of the main crown facets 20B, one of the main crown facets 20C, and one of the pairs of upper girdle facets 22B.

The upper vertex of each of the lower intermediate crown facets 18A abuts a lower vertex of one of the star facets 14A, a lateral vertex of the upper intermediate crown facet 16A, and a lateral vertex of one of the upper intermediate crown facets 16B. The lower vertex of each of the lower intermediate crown facets 18A abuts a lateral vertex of the main crown facet 20A, a lateral vertex of one of the main crown facets 20B, and the upper vertices of each of one of the pairs of upper girdle facets 22A. Each lateral vertex of the lower intermediate crown facets 18A abuts a lower vertex of either (i) the upper intermediate crown facet 16A or (ii) one of the upper intermediate crown facets 16B, a lateral vertex of either (i) the other lower intermediate crown facet 18A or (ii) one of the lower intermediate crown facets 18B, and an upper vertex of either (i) the main crown facet 20A or (ii) one of the main crown facets 20B. Each upper edge of the lower intermediate crown facets 18A is shared with a lower edge either (i) the upper intermediate crown facet 16A or (ii) one of the upper intermediate crown facets 16B. Each lower edge of the lower intermediate crown facets 18A is shared with an upper edge of either (i) the main crown facet 20A or (ii) one of the main crown facets 20B.

The upper vertex of each of the lower intermediate crown facets 18B abuts a lower vertex of one of the star facets 14B, a lateral vertex of one of the upper intermediate crown facets 16B, and a lateral vertex of one of the upper intermediate crown facets 16C. The lower vertex of each of the lower intermediate crown facets 18B abuts a lateral vertex of one of the main crown facets 20B, a lateral vertex of one of the main crown facets 20C, and the upper vertices of each of one of the pairs of upper girdle facets 22B. Each lateral vertex of the lower intermediate crown facets 18B abuts a lower vertex of either (i) one of the upper intermediate crown facets 16B or (ii) one of the upper intermediate crown facets 16C, a lateral vertex of either (i) one of the lower intermediate crown facets 18A or (ii) one of the lower intermediate crown facets 18B, and an upper vertex of either (i) one of the main crown facets 20B or (ii) one of the main crown facets 20C. Each upper edge of the lower intermediate crown facets 18B is shared with a lower edge either (i) one of the upper intermediate crown facets 16B or (ii) one of the upper intermediate crown facets 16C. Each lower edge of the lower intermediate crown facets 18A is shared with an upper edge of either (i) one of the main crown facets 20B or (ii) one of the main crown facets 20C.

The upper and lower vertices of each of the lower intermediate crown facets 18A-18B are generally shifted away from each other. Thus, the angle bisector of the upper vertex of each one of the lower intermediate crown facets 18A-18B does not also bisect the angle formed at the lower vertex of the same one of the lower intermediate crown facets 18A-18B. The upper vertices of each of the lower intermediate crown facets 18A-18B are generally shifted toward the closest tapered end of the gemstone 1. The distance between the upper and lower vertices generally decreases from the lower intermediate crown facets 18A to the lower intermediate crown facets 18B. Thus, the shapes of the lower intermediate crown facets 18A-18B can vary depending on their location along the crown 10. However, in other implementations, any one of the groups of lower intermediate crown facets 18A-18B can have the same size and shape as any of the other groups of lower intermediate crown facets 18A-18B.

The crown 10 includes a number of upper intermediate crown facets, which include two upper intermediate crown facet 16A, four upper intermediate crown facets 16B, and two upper intermediate crown facets 16C. Each of the upper intermediate crown facets 16A-16C are generally diamond or kite-shaped, and has an upper vertex, a lower vertex, two lateral vertices, two upper edges, and two lower edges.

Each of the upper intermediate crown facet 16A are generally split in half by the major axis A₁, and are disposed on either side of the minor axis A₂. Thus, each of the upper intermediate crown facets 16A are disposed generally between the respective main crown facets 20A and the table 12. About half the surface area of a first of the upper intermediate crown facet 16A is in the first quadrant 11A on the first side 15A of the crown 10, and about half of its surface area in the second quadrant 11B on the second side 15B of the crown 10. Similarly, about half the surface area of the second of the upper intermediate crown facets 16A is in the fourth quadrant 11D on the first side 15A of the crown 10, and the remaining half of the surface area in the third quadrant 11C on the second side 15B of the crown 10.

The upper intermediate crown facets 16A are generally positioned between the table 12, two star facets 14A, two upper intermediate crown facets 16B, two lower intermediate crown facets 18A, and a main crown facet 20A. Generally, the upper intermediate crown facets 16A are positioned at the same location along the minor axis A₂. The upper intermediate crown facets 16A are thus disposed along the major axis A₁.

A pair of the upper intermediate crown facets 16B is disposed on either side of the minor axis A₂, between the table 12 and respective main crown facets 20B. A first upper intermediate crown facet 16B is disposed to the right of the major axis A₁, in the first quadrant 11A. A second upper intermediate crown facet 16B is disposed to the left of the major axis A₁, in the second quadrant 11B. A third upper intermediate crown facet 16B is disposed to the left of the major axis A₁, in the third quadrant 11C. A fourth upper intermediate crown facet 16B is disposed to the right of the major axis A₁, in the fourth quadrant 11D. Each upper intermediate crown facet 16B is generally positioned between the table 12, one of the star facets 14A, one of the star facets 14B, the upper intermediate crown facet 16A, one of the upper intermediate crown facets 16C, one of the lower intermediate crown facets 18A, one of the lower intermediate crown facets 18B, and one of main crown facets 20B. Generally, the two upper intermediate crown facets 16B in each respective pair are positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and separated from the minor axis A₂.

The two upper intermediate crown facets 16C are disposed to the left and the right of the major axis A₁, between the table 12 and respective main crown facets 20C. The upper intermediate crown facets 16C are disposed such that about half of the surface area of each of the upper intermediate crown facets 16C is positioned above the minor axis A₂, and about half of the surface area of each of the upper intermediate crown facets 16C is positioned below the minor axis A₂due to the symmetric arrangement. Thus, a first upper intermediate crown facet 16C is disposed on the first side 15A of the crown 10 between the table 12 and the first main crown facet 20C, with about half of its surface area in the first quadrant 11A, and about half of its surface area in the fourth quadrant 11D. A second upper intermediate crown facet 16C is disposed on the second side 15B of the crown 10 between the table 12 and the second main crown facet 20C, with about half of its surface area in the second quadrant 11B, and about half of its surface area in the third quadrant 11C. Each upper intermediate crown facet 16C is generally positioned between the table 12, two of the star facets 14B, two of the upper intermediate crown facets 16B, two of the lower intermediate crown facets 18B, and one of main crown facets 20C. Generally, the two upper intermediate crown facets 16C are positioned at the same location along the major axis A₁, and are thus disposed along the minor axis A₂.

The upper vertex of the upper intermediate crown facet 16A abuts a vertex of the table 12, and lateral vertices of the two star facets 14A. The lower vertex of the upper intermediate crown facet 16A abuts the upper vertex of the main crown facet 20A, and a lateral vertex of each of the lower intermediate crown facets 18A. Each lateral vertex of the upper intermediate crown facet 16A abuts a lower vertex of one of the star facets 14A, a lateral vertex of one of the upper intermediate crown facets 16B, and the upper vertex of one of the lower intermediate crown facets 18A. Each upper edge of the upper intermediate crown facet 16A is shared with a lower edge of one of the star facets 14A. Each lower edge of the upper intermediate crown facet 16A is shared with an upper edge of one of the lower intermediate crown facets 18A.

The upper vertex of each of the upper intermediate crown facets 16B abuts a vertex of the table 12, a lateral vertex of one of the star facets 14A, and a lateral vertex of one of the star facets 14B. The lower vertex of each of the upper intermediate crown facets 16B abuts an upper vertex of one of the main crown facets 20B, a lateral vertex of one of the lower intermediate crown facets 18A, and a lateral vertex of one of the lower intermediate crown facets 18B. Each lateral vertex of each of the upper intermediate crown facets 16B abuts a lower vertex of either (i) one of the star facets 14A or (ii) one of the star facets 14B, a lateral vertex of (i) the upper intermediate crown facet 16A or (ii) one of the upper intermediate crown facets 16C, a upper vertex of (i) one of the lower intermediate crown facets 18A or (ii) one of the lower intermediate crown facets 18B, and the upper vertex of one of the main crown facets 20B. Each upper edge of each of the upper intermediate crown facets 16B is shared with a lower edge of (i) one of the star facets 14A or (ii) one of the star facets 14B. Each lower edge of each of the upper intermediate crown facets 16B is shared with an upper edge of (i) one of the lower intermediate facets 18A or (ii) one of the lower intermediate facets 18B.

The upper vertex of each of the upper intermediate crown facets 16C abuts a vertex of the table 12 and a lateral vertex of one of the star facets 14B. The lower vertex of each of the upper intermediate crown facets 16C abuts an upper vertex of one of the main crown facets 20C and a lateral vertex of one of the lower intermediate crown facets 18B. Each lateral vertex of each of the upper intermediate crown facets 16C abuts a lower vertex of one of the star facets 14B, a lateral vertex of one of the upper intermediate crown facets 16B, and an upper vertex of one of the lower intermediate crown facet 18B. Each upper edge of each of the upper intermediate crown facets 16C is shared with a lower edge of one of the star facets 14B. Each lower edge of each of the upper intermediate crown facets 16C is shared with an upper edge of one of the lower intermediate facets 18B.

While all of the upper intermediate crown facets 16A-16C are diamond or kite-shaped, in some implementations their shapes are all slightly different due to the elongated shape of the pointed ends of the crown 10. Upper intermediate crown facets 16A and 16E are both generally symmetrical across the major axis A₁. Moreover, the upper and lower vertices of each of the upper intermediate crown facets 16B are generally shifted away from each other. Thus, the angle bisector of the upper vertex of each one of the upper intermediate crown facets 16B does not also bisect the angle formed at the lower vertex of the same one of the upper intermediate crown facets 16B. The upper vertex of each of the upper intermediate crown facets 16B is generally shifted toward the nearest pointed end of the gemstone 1.

Thus, the shapes of the upper intermediate crown facets 16A-16C can vary depending on their location along the crown 10. However, in other implementations, any one of the groups of upper intermediate crown facets 16A-16C can have the same size and shape as any of the other groups of upper intermediate crown facets 16A-16C.

The crown 10 includes four star facets 14A, and four star facets 14B. Each of the star facets 14A-14B is disposed adjacent to and abutting an edge of the table 12. Each of the star facets 14A-14B is generally triangle-shaped with two upper vertices, a lower vertex, an upper edge, and two lower edges.

The four star facets 14A are disposed towards the pointed ends of the crown 10, on either side of the minor axis A₂, and on either side of the major axis A₁. Accordingly, a first star facet 14A is disposed to the right of the major axis A₁, in the first quadrant 11A. A second star facet 14A is disposed to the left of the major axis A₁, in the second quadrant 11B, a third star facet 14A is disposed to the left of the major axis A₁, in the third quadrant 11C. Moreover, a fourth star facet 14A is disposed to the right of the major axis A₁, in the fourth quadrant 11D.

Generally, the first and second star facets 14A are positioned at a same location along the major axis A₁towards the first pointed end 13A. Moreover, third and fourth star facets 14A are positioned at a same location along the major axis A₁towards the second pointed end 13B. Each of the star facets 14A (e.g., each star facet 14A in the corresponding pairs) are positioned a same distance from the minor axis A₂in some implementations. Each of the star facets 14A is generally positioned between the table 12, the other star facet 14A, one of the star facets 14B, the upper intermediate crown facet 16A, one of the upper intermediate crown facets 16B, and one of the lower intermediate crown facets 18A.

The four star facets 14B are also disposed on either side of the minor axis A₂, as well as on both sides 15A, 15B of the crown 10. Thus, a first star facet 14B is disposed to the right of the major axis A₁, in the first quadrant 11A. The star facet 14B is positioned between the first star facet 14A and the opposing half 13B of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A second star facet 14B is disposed to the left of the major axis A₁, in the second quadrant 11B. The second star facet 14B is positioned between the table 12 and the opposing half 13B of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

Furthermore, a fourth star facet 14B is disposed to the left of the major axis A₁, in the third quadrant 11C. The star facet 14B is positioned between the first star facet 14A and the opposing half 13A of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A fourth star facet 14B is further disposed to the right of the major axis A₁, in the fourth quadrant 11C. The second star facet 14B is positioned between the table 12 and the opposing half 13A of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

Each of the star facets 14B is generally positioned between the table 12, one of the star facets 14A, one of the star facets 14B, one of the upper intermediate crown facets 16B, one of the upper intermediate crown facets 16C, and one of the lower intermediate crown facets 18B.

One upper vertex of each of the star facets 14A abuts a vertex of the table 12, an upper vertex of the other star facet 14A, and an upper vertex of the upper intermediate crown facet 16A. The other upper vertex of each of the star facets 14A abuts a different vertex of the table 12, an upper vertex of one of the star facets 14B, and the upper vertex of one of the upper intermediate crown facets 16B. The lower vertex of each of the star facets 14A abuts a lateral vertex of the upper intermediate crown facet 16A, a lateral vertex of one of the upper intermediate crown facets 16B, and the upper vertex of one of the lower intermediate crown facets 18A. The upper edge of each of the star facets 14A is shared with an edge of the table 12. One of the lower edges of each of the star facets 14A is shared with an upper edge of the upper intermediate crown facet 16A. The other lower edge of each of the star facets 14A is shared with an upper edge of one of the upper intermediate crown facets 16B.

One upper vertex of each of the star facets 14B abuts a vertex of the table 12, an upper vertex of one of the star facets 14A, and the upper vertex of one of the upper intermediate crown facets 16B. The other upper vertex of each of the star facets 14B abuts a different vertex of the table 12, an upper vertex of one of the star facets 14B, and the upper vertex of one of the upper intermediate crown facets 16C. The lower vertex of each of the star facets 14B abuts a lateral vertex of one of the upper intermediate crown facets 16B, a lateral vertex of one of the upper intermediate crown facets 16C, and the upper vertex of one of the lower intermediate crown facets 18B. The upper edge of each of the star facets 14B is shared with an edge of the table 12. One of the lower edges of each of the star facets 14B is shared with an upper edge of one of the upper intermediate crown facets 16B. The other lower edge of each of the star facets 14B is shared with an upper edge of one of the upper intermediate crown facets 16C.

While all of the star facets 14A-14B are triangle-shaped, in some implementations their shapes are all slightly different due to the pointed ends 13A, 13B of the crown 10. The lower vertex of each of the star facets 14A-14B is generally shifted slight towards the nearest pointed end 13A, 13B of the crown 10, such that the angle bisector of the lower vertex of each of the star facets 14A-14B does not intersect the upper edges of each of the star facets 14A-14B at the midway point of the upper edges. Further, the distance between the two upper vertices of each of the star facets 14A is generally less than the same distance on each of the star facets 14B. Finally, the height of each of the star facets 14A (e.g., the distance between the lower vertex and the upper edge) is generally greater than the height of each of the star facets 14B.

The table 12 is a generally horizontal surface having a number of edges and is located at the top of the crown 10. In the implementation illustrated in FIG. 2, table 12 has a generally octagonal shape. In this implementation, four edges of the table 12 are shared with the star facets 14A, and four of the edges of the table 12 are shared with the star facets 14B. Other shapes for table 12 are contemplated in other implementations. In some implementations, the table 12 has equal dimensions along the major axis A₁and the minor axis A₂. In other implementations, the table 12 has a generally longer dimension along the major axis A₁, and a generally shorter dimension along the minor axis A₂. In still other implementations, the table 12 has a generally shorter dimension along the major axis A₁, and a generally longer dimension along the minor axis A₂.

Referring now to FIG. 3, a bottom plan view of the gemstone 1 showing the pavilion 30 is illustrated. In describing the facets of the crown pavilion 30 shown in FIG. 3, reference is made to a first of the pointed ends 33A and the second pointed end 33B of the pavilion 30. First and second sides 15A, 15B of the pavilion 30 have also been indicated. The ends 33A and 33B of the pavilion 30 generally correspond to the ends 3A and 3B of the crown 10.

The major axis A₁of the perimeter of the gemstone (which is formed by the girdle 50) extends vertically relative to the plane of FIG. 3 (between the first side 15A of the pavilion 30 and the second side 15B of the pavilion 30), while the minor axis A₂extends horizontally relative to the plane of FIG. 3 (between the pointed ends 33A, 33B of the pavilion 30). As shown in FIG. 3, the major axis A₁and the major axis A₁generally intersect at a lower point where a lower vertex of the culet-adjacent facets 32A, 32B, 32C meet. The major axis A₁divides the table 12 between a “left” portion and “right” portion, and the minor axis A₂divides the table 12 into a “top” portion and a “bottom” portion. The major axis A₁divides pavilion 30 generally in half between the first side 15A and the second side 15B. The minor axis A₂also generally divides the pavilion 30 in half between the pointed ends 33A, 33B.

The major and minor axes A₁and A₂generally divide the facets of the pavilion 30 into a first quadrant 31A, a second quadrant 31B, a third quadrant 31C, and fourth quadrant 31D. The first quadrant 31A generally corresponds to the top-right corner region of the pavilion 30 relative to the plane of FIG. 3. The second quadrant 31B generally corresponds to the top-left corner region of the pavilion 30 relative to the plane of FIG. 3. The third quadrant 31C generally corresponds to the bottom-left corner region of the pavilion 30 relative to the plane of FIG. 3. The fourth quadrant 31D generally corresponds to the bottom-right corner region of the pavilion 30 relative to the plane of FIG. 3.

The terms “top,” “bottom,” “left,” “right,” “above,” below,” etc. are used herein to refer to the locations of the various facets on the pavilion 30. However, those of skill in the art will understand that these are relative terms that are generally used in reference to the plane of FIG. 3. Thus, any of these terms used to describe an individual facet may not apply when viewing the pavilion 30 from a different perspective. The facets on the surface of the pavilion 30 share edges and vertices where the facets meet. The facets on the surface of the pavilion 30 share edges and vertices where the facets meet. When describing the facets on the surface of the pavilion 30, the term “lower” is used to refer to edges or vertices nearer to the lower point, while the term “upper” is used to refer to edges or vertices nearer to the girdle 50.

The pavilion 30 includes a number of main pavilion facets, which include two main pavilion facet 36A, four main pavilion facets 36B, and two main pavilion facets 36C. Each main pavilion facet 36A-36C, is generally diamond or kite-shaped with a flattened lower edge. Thus, each main pavilion facet 36A-36C has a pentagon shape with two lower vertices, two lateral vertices, and an upper vertex; and a lower edge, two lateral edges, and two upper edges.

Main pavilion facets 36A are each generally split in half by the major axis A₁, and are disposed on opposite sides of the minor axis A₂. Thus, main pavilion facets 36A are disposed towards one of the pointed ends 33A, 33B of the pavilion 30, and preferably centered along the major axis A₁. Main pavilion facets 36A in a first pair are disposed with about half their respective surface area in the first quadrant 31A on the first side 15A of the pavilion 30, and about half of their respective surface area in the second quadrant 31B on the second side 15B of the pavilion 30. Main pavilion facets 36A in a second pair are disposed with about half their respective surface area in the fourth quadrant 31D on the first side 15A of the pavilion 30, and about half of their respective surface area in the third quadrant 31C on the second side 15B of the pavilion 30. The main pavilion facet 36A is generally positioned between the culet-adjacent facet 32A, the two candle facets 34A, a lower girdle facet 38A from each of two pairs of lower girdle facets 38A, and the lower edge of the girdle 50. Generally, the main pavilion facets 36A is positioned at the same location along the minor axis A₂as each other. The main pavilion facets 36A are thereby disposed along the major axis A₁.

The two pairs of main pavilion facets 36B are disposed on either side of the minor axis A₂. A first main pavilion facet 36B is disposed to the right of the major axis A₁, in the first quadrant 31A. A second main pavilion facet 36B is disposed to the left of the major axis A₁, in the second quadrant 31B. A third main pavilion facet 36B is disposed to the left of the major axis A₁, in the third quadrant 31C. Moreover, a fourth main pavilion facet 36B is disposed to the right of the major axis A₁, in the fourth quadrant 31D.

Each main pavilion facet 36B is generally positioned between one of the culet-adjacent facets 32B, one of the candle facets 34A, one of the candle facets 34B, a lower girdle facet 38A from one pair of lower girdle facets 38A, a lower girdle facet 38B from one pair of lower girdle facets 38B, and the lower edge of the girdle 50. Generally, the two main pavilion facets 36B in each corresponding pair are positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and spaced from the minor axis A₂.

The two main pavilion facets 36C are disposed at opposite ends of the minor axis A₂, and are disposed to the left and to the right of the major axis A₁. The main pavilion facets 36C are disposed such that about half of the surface area of each of the main pavilion facets 36C is above the minor axis A₂, and about half the surface area is below the minor axis A₂. Thus, a first main pavilion facet 36C is disposed on the first side 15A of the pavilion 30, with about half of its surface area in the first quadrant 31A, and about half of its surface area in the fourth quadrant 31D. A second main pavilion facet 36C is disposed on the second side 15B of the pavilion 30, with about half of its surface area in the second quadrant 31B, and about half of its surface area in the third quadrant 31C. Each main pavilion facet 36C is generally positioned between one of the culet-adjacent facets 32C, two of the candle facets 34B, two lower girdle facet 38B from adjacent pairs of lower girdle facets 38B, and the lower edge of the girdle 50. Generally, the two main pavilion facets 36C are positioned at the same location along the major axis A₁, and are thus disposed along the minor axis A₂.

The two lower vertices of the main pavilion facet 36A each abut one of the upper vertices of the culet-adjacent facet 32A, and a lower-lateral vertex of each of the candle facets 34A. The two lateral vertices of the main pavilion facet 36A each abut an upper-lateral vertex of each of the candle facets 34A, and a lower vertex of a lower girdle facet 38A of each of the lower girdle facets 38A.

The lower edge of the main pavilion facet 36A is shared with the upper edge of the culet-adjacent facet 32A. One lateral edge of the main pavilion facet 36A is shared with a lateral edge of one of the candle facets 34A, and the other lateral edge of the main pavilion facet 36A is shared with a lateral edge of the other one of the candle facets 34A. One upper edge of the main pavilion facet 36A is shared with an edge of a lower girdle facet 38A from one pair of lower girdle facets 38A, and the other upper edge of the main pavilion facet 36A is shared with an edge of a lower girdle facet 38A from the other pair of lower girdle facets 38A.

The two lower vertices of each of the main pavilion facets 36B each abut one of the upper vertices of one of the culet-adjacent facets 32B, a lower-lateral vertex of one of the candle facets 34A, and a lower-lateral vertex of one of the candle facets 34B. The two lateral vertices of each of the main pavilion facets 36B each abut an upper-lateral vertex of one of the candle facets 34A, an upper-lateral vertex of one of the candle facets 34B, a lower vertex of a lower girdle facet 38A of one of the lower girdle facets 38A, and a lower vertex of a lower girdle facet 38B of one of the lower girdle facets 38B.

The lower edge of the each of the main pavilion facets 36B is shared with the upper edge of one of the culet-adjacent facets 32B. One lateral edge of each of the main pavilion facets 36B is shared with a lateral edge of one of the candle facets 34A, and the other lateral edge of each of the main pavilion facets 36B is shared with a lateral edge of one of the candle facets 34B. One upper edge of each of the main pavilion facets 36B is shared with an edge of a lower girdle facet 38A from one of the pairs of lower girdle facets 38A, and the other upper edge of each of the main pavilion facets 36B is shared with an edge of a lower girdle facet 38B from one of the pairs of lower girdle facets 38B.

The two lower vertices of each of the main pavilion facets 36C each abut one of the upper vertices of one of the culet-adjacent facets 32C, and a lower-lateral vertex of two of the candle facets 34B. The two lateral vertices of each of the main pavilion facets 36C each abut an upper-lateral vertex of two of the candle facets 34B, and a lower vertex of a lower girdle facet 38B of adjacent pairs of the lower girdle facets 38B.

The lower edge of the each of the main pavilion facets 36C is shared with the upper edge of one of the culet-adjacent facets 32C. Lateral edges of the main pavilion facets 36C are shared with lateral edges of the candle facets 34B. Moreover, upper edges of each of the main pavilion facets 36C is shared with an edge of a lower girdle facet 38B from adjacent pairs of lower girdle facets 38B.

While all of the main pavilion facets 36A-36C are generally pentagon-shaped with a flattened lower edge, in some implementations their shapes are all slightly different due to the elongated shape of the pointed ends 33A, 33B. For instance, the main pavilion facets 36A are both generally symmetrical across the major axis A₁in preferred implementations.

In each of the main pavilion facets 36B, the upper vertex is generally shifted away from the lower edge. Thus, the angle bisector of the upper vertex does not intersect at the midpoint of the lower edges. The upper vertex of each of the main pavilion facets 36B is generally shifted toward the closer pointed end 33A, 33B. Thus, the shapes of the main pavilion facets 36A-36C can vary depending on their location along the pavilion 30. However, in other implementations, any one of the groups of main pavilion facets 36A-36C can have the same size and shape as any of the other groups of main pavilion facets 36A-36C.

The pavilion 30 includes four pairs of lower girdle facets 38A, and four pairs of lower girdle facets 38B. Each of the lower girdle facets 38A-38B has a generally triangular shape. However, each pair of lower girdle facets 38A-38B forms a notch into which one of the candle facets fits. Thus, each lower girdle facet 38A-38B has four edges and four vertices, while maintaining a generally triangular shape. Each pair of lower girdle facets 38A-38B is formed as two triangular-shaped facets sharing one generally straight edge.

Two pairs of lower girdle facets 38A are disposed at either of the pointed ends 33A, 33B of the pavilion 30, on either side of the major axis A₁. A first pair of lower girdle facets 38A is disposed to the right of the major axis A₁, in the first quadrant 31A. A second pair of lower girdle facets 38A is disposed to the left of the major axis A₁, in the second quadrant 31B. A third pair of lower girdle facets 38A is disposed to the left of the major axis A₁, in the third quadrant 31C. A fourth pair of lower girdle facets 38D is disposed to the right of the major axis A₁, in the fourth quadrant 31D.

Generally, the first and second pairs of lower girdle facets 38A are positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and above the minor axis A₂. Similarly, the third and fourth pairs of lower girdle facets 38A may be positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and above the minor axis A₂.

Each lower girdle facet 38A in each pair of lower girdle facets 38A is generally positioned between one of the candle facets 34A, either (i) the main pavilion facet 36A or (ii) one of the main pavilion facets 36B, the other lower girdle facet 38A in the same pair of lower girdle facets 38A, and either (i) a lower girdle facet 38A from an adjacent pair of lower girdle facets 38A or (ii) a lower girdle facet 38B from an adjacent pair of lower girdle facets 38B.

Two pairs of lower girdle facets 38B are disposed on either side of the minor axis A₂, as well as on either side of the major axis A₁. A first pair of lower girdle facets 38B is disposed to the right of the major axis A₁, in the first quadrant 31A. The first pair of lower girdle facets 38B is positioned between the first pair of lower girdle facets 38A and the opposing half 33B of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A second pair of lower girdle facets 38B is disposed to the left of the major axis A₁, in the second quadrant 31B. The second pair of lower girdle facets 38B is positioned between the second pair of lower girdle facets 38A and the opposing half 33B of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

A third pair of lower girdle facets 38B is disposed to the left of the major axis A₁, in the third quadrant 31C. The third pair of lower girdle facets 38B is positioned between the first pair of lower girdle facets 38A and the opposing half 33A of the gemstone 1, as divided along the minor axis A₂, in a clockwise direction along the circumference of the gemstone 1. A fourth pair of lower girdle facets 38B is disposed to the right of the major axis A₁, in the fourth quadrant 31D. The fourth pair of lower girdle facets 38B is positioned between the second pair of lower girdle facets 38A and the opposing half 33A of the gemstone 1, as divided along the minor axis A₂, in a counter-clockwise direction along the circumference of the gemstone 1.

Each lower girdle facet 38B in each pair of lower girdle facets 38B is generally positioned between one of the candle facets 34B, either (i) one of the main pavilion facets 36B or (ii) one of the main pavilion facets 36C, the other lower girdle facet 38B in the same pair of lower girdle facets 38A, and either (i) a lower girdle facet 38A from an adjacent pair of lower girdle facets 38A or (ii) a lower girdle facet 38B from an adjacent pair of lower girdle facets 38B.

A lower vertex of each lower girdle facet 38A abuts an upper-lateral vertex of one of the candle facets 34A. A lateral vertex of each lower girdle facet 38A abuts an upper vertex of one of the candle facets 34A. One upper vertex of each lower girdle facet 38A abuts an upper vertex of the other lower girdle facet 38A in the pair of lower girdle facets 38A. The other upper vertex of each lower girdle facet 38A abuts an upper vertex of either (i) a lower girdle facet 38A from an adjacent pair of lower girdle facets 38A, or (ii) a lower girdle facet 38B from an adjacent pair of lower girdle facets 38B.

A first edge of each lower girdle facet 38A is shared with an upper edge of one of the candle facets 34A. A second edge of each lower girdle facet 38A is shared with an upper edge of either (i) the main pavilion facet 36A or (ii) one of the main pavilion facets 36B. A third edge of each lower girdle facet 38A is shared with an edge of the lower girdle facet 38A in the same pair of lower girdle facets 38A. An upper edge of each lower girdle facet 38A is shared with the lower edge of the girdle 50.

A lower vertex of each lower girdle facet 38B abuts an upper-lateral vertex of one of the candle facets 34B. A lateral vertex of each lower girdle facet 38B abuts an upper vertex of one of the candle facets 34B. One upper vertex of each lower girdle facet 38B abuts an upper vertex of the other lower girdle facet 38B in the pair of lower girdle facets 38B. The other upper vertex of each lower girdle facet 38B abuts an upper vertex of either (i) a lower girdle facet 38A from an adjacent pair of lower girdle facets 38A, or (ii) a lower girdle facet 38B from an adjacent pair of lower girdle facets 38B.

A first edge of each lower girdle facet 38B is shared with an upper edge of one of the candle facets 34B. A second edge of each lower girdle facet 38B is shared with an upper edge of either (i) one of the main pavilion facets 36B or (ii) one of the main pavilion facets 36C. A third edge of each lower girdle facet 38B is shared with an edge of the lower girdle facet 38B in the same pair of lower girdle facets 38B. An upper edge of each lower girdle facet 38B is shared with the lower edge of the girdle 50.

In the illustrated implementation, the upper edge of the lower girdle facets 38A-38B generally increases as the lower girdle facet is closer toward the pointed ends 33A, 33B of the pavilion 30. Thus, the combined length of the upper edges of each pair of lower girdle facets 38B is generally greater than the combined length of the upper edges of each pair of lower girdle facets 38A. However, in other implementations, the upper edges of some or all of the lower girdle facets 38A-38B are generally the same length, such that all of the lower girdle facets 38A-38B are the same size.

Eight culet-adjacent facets are formed at the lowermost portion of the pavilion 30, which includes two culet-adjacent facet 32A, four culet-adjacent facets 32B, and two culet-adjacent facets 32C. Each culet-adjacent facet 32A-32C has a generally pentagonal shape with a lower vertex, two lateral vertices, and two upper vertices; and a flat upper edge, two lateral edges, and two lower edges. The flat upper edge is opposite the lower vertex of each culet-adjacent facet 32A-32C. In some implementations, the two lower edges of each of the culet-adjacent facets 32A-32C terminate in a culet, which is a horizontal surface forming the bottom of the pavilion 30. In the implementation illustrated in FIG. 3, the lower edges of each of the culet-adjacent facets 32A-32C terminates in a bottom vertex. Together, the bottom vertices of each of the culet-adjacent facets 32A-32C form the lower point of the gemstone 1 (see FIGS. 1A and 1B).

Culet-adjacent facets 32A are generally split in half by the major axis A₁, and are disposed on either side of the minor axis A₂. Moreover, culet-adjacent facets 32A are disposed such a first of the culet-adjacent facets 32A has about half its surface area in the first quadrant 31A on the first side 15A of the pavilion 30, and about half of its surface area in the second quadrant 31B on the second side 15B of the pavilion 30. A second of the culet-adjacent facets 32A has about half its surface area in the fourth quadrant 31D on the first side 15A of the pavilion 30, and about half of its surface area in the third quadrant 31C on the second side 15B of the pavilion 30. The second culet-adjacent facet 32A is also generally positioned between two culet-adjacent facets 32B, two candle facets 34A, and the main pavilion facet 36A. Generally, the culet-adjacent facets 32A are positioned at the same location along the minor axis A₂. The culet-adjacent facets 32A are also disposed along the major axis A₁.

The culet-adjacent facets 32B are disposed on either side of the minor axis A₂. A first culet-adjacent facet 32B is disposed to the right of the major axis A₁, in the first quadrant 31A. A second culet-adjacent facet 32B is disposed to the left of the major axis A₁, in the second quadrant 31B. A third culet-adjacent facet 32B is disposed to the left of the major axis A₁, in the third quadrant 31C, and a fourth culet-adjacent facet 32B is disposed to the right of the major axis A₁, in the fourth quadrant 31D.

Each culet-adjacent facet 32B is generally positioned between one of the culet-adjacent facets 32A, one of the culet-adjacent facets 32C, one of the candle facets 34A, one of the candle facets 34B, and one of the main pavilion facets 36B. Generally, each corresponding pair of the main pavilion facets 36B are positioned at the same location along the major axis A₁, and are thus disposed along an axis that is parallel to and above the minor axis A₂.

The two culet-adjacent facets 32C are disposed at opposite ends of the minor axis A₂, and are disposed to either side of the major axis A₁. The culet-adjacent facets 32C are disposed such that about half of the surface area of each of the culet-adjacent facets 32C is above the minor axis A₂, and about half of the surface area is below the minor axis A₂. Thus, a first culet-adjacent facet 32C is disposed on the first side 15A of the pavilion 30, with about half of its surface area in the first quadrant 31A, and about half of its surface area in the fourth quadrant 31D. A second culet-adjacent facet 32C is disposed on the second side 15B of the pavilion 30, with about half of its surface area in the second quadrant 31B, and about half of its surface area in the third quadrant 31C. Each culet-adjacent facet 32C is generally positioned between two of the culet-adjacent facets 32B, two of the candle facets 34B, and one of the main pavilion facets 36C. Generally, the two culet-adjacent facets 32C are positioned at the same location along the major axis A₁, and are thus disposed along the minor axis A₂.

The lower vertex of the culet-adjacent facets 32A abut the lower vertices of each of the other culet-adjacent facets 32B-32C, to form the lower point. The two lateral vertices of the culet-adjacent facet 32A each abut a lateral vertex of one of the culet-adjacent facets 32B, and a lower vertex of one of the candle facets 34A. The two upper vertices of the culet-adjacent facet 32A each abut a lower-lateral vertex of one of the candle facets 34A, and one of the lower vertices of the main pavilion facet 36A.

The upper edge of the culet-adjacent facet 32A is shared with the lower edge of the main pavilion facet 36A. Each of the two lateral edges of the culet-adjacent facet 32A is shared with a lower edge of one of the candle facets 34A. Each of the two lower edges of the culet-adjacent facet 32A is shared with a lower edge of one of the culet-adjacent facets 32B.

The lower vertex of each of the culet-adjacent facets 32B abuts the lower vertices of each of the other culet-adjacent facets 32A and 32C, to form the lower point. Each of the two lateral vertices of each of the culet-adjacent facets 32B abuts a lateral vertex of either (i) the culet-adjacent facet 32A or (ii) one of the culet-adjacent facets 32C, and a lower vertex of either (i) one of the candle facets 34A or (ii) one of the candle facets 34B. Each of the two upper vertices of each of the culet-adjacent facets 32B abuts a lower-lateral vertex either (i) one of the candle facets 34A or (ii) one of the candle facets 34B, and one of the lower vertices of one of the main pavilion facets 36C.

The upper edge of each of the culet-adjacent facets 32B is shared with the lower edge of one of the main pavilion facets 36B. Each of the two lateral edges of each of the culet-adjacent facets 32B is shared with a lower edge of either (i) one of the candle facets 34A or (ii) one of the candle facets 34B. Each of the two lower edges of each of the culet-adjacent facets 32B is shared with a lower edge of either (i) the culet-adjacent facet 32A or (ii) one of the culet-adjacent facets 32C.

The lower vertex of each of the culet-adjacent facets 32C abuts the lower vertices of each of the other culet-adjacent facets 32A-32B, to form the lower point. Each of the two lateral vertices of each of the culet-adjacent facets 32C abuts a lateral vertex of adjacent ones of the culet-adjacent facets 32B, and a lower vertex of either of the candle facets 34B. Each of the two upper vertices of each of the culet-adjacent facets 32C abuts a lower-lateral vertex either of the candle facets 34B, and one of the lower vertices of one of the main pavilion facets 36C.

The upper edge of each of the culet-adjacent facets 32C is shared with the lower edge of one of the main pavilion facets 36C. Each of the two lateral edges of each of the culet-adjacent facets 32C is shared with a lower edge of one of the candle facets 34B. Each of the two lower edges of each of the culet-adjacent facets 32C is shared with a lower edge of adjacent culet-adjacent facets 32B.

While all of the culet-adjacent facets 32A-32C are generally pentagon-shaped with a flattened upper edge, in some implementations their shapes are all slightly different due to the elongated shape of the pointed ends 33A, 33B of the pavilion 30. For instance, culet-adjacent facets 32A are generally symmetrical across the major axis A₁, while culet-adjacent facets 32C are generally symmetrical across the minor axis A₂. However, in each of the culet-adjacent facets 32B, the lower vertex is generally shifted away from the midpoint of the upper edge. Thus, the angle bisectors of the lower vertices do not intersect at the midpoint of the upper edges in culet-adjacent facets 32B. The lower vertex of each of the culet-adjacent facets 32B is generally shifted toward the nearer of the two pointed ends 33A, 33B.

Thus, the shapes of the culet-adjacent facets 32A-32C can vary depending on their location along the pavilion 30. However, in other implementations, any one of the groups of culet-adjacent facets 32A-32C can have the same size and shape as any of the other groups of culet-adjacent facets 32A-32C.

The pavilion 30 includes four candle facets 34A, and four candle facets 34B. Each candle facet 34A-34B has an elongated shape with six vertices and six edges. The six vertices include an upper vertex, two upper-lateral vertices, two lower-lateral vertices, and a lower vertex. The six edges include two upper edges, two lower edges, and two lateral edges.

Each corresponding pair of the candle facets 34A is disposed at the same location along the major axis A₁, on either side of the minor axis A₂. In other words, a first candle facet 34A is disposed to the right of the major axis A₁, in the first quadrant 31A. A second candle facet 34A is disposed to the left of the major axis A₁, in the second quadrant 31B. A third candle facet 34A is also disposed to the left of the major axis A₁, in the third quadrant 31C, and a fourth candle facet 34A is disposed to the right of the major axis A₁, in the fourth quadrant 31D.

Each of the candle facets 34A, 34B have a longer length along a respective longitudinal axis than a width measured in a directional perpendicular thereto. In other words, each of the candle facets 34A, 34B have a larger vertical component (relative to the plane of FIG. 3) than horizontal component. Each candle facet 34A is generally positioned between the culet-adjacent facet 32A, one of the culet-adjacent facets 32B, the main pavilion facet 36A, one of the main pavilion facets 36B, and one of the pairs of lower girdle facets 38A. A lower portion of each of the candle facets 34A extends between the culet-adjacent facet 32A and one of the culet-adjacent facets 32B. An upper portion of each of the candle facets 34A extends between the two lower girdle facets 38A of one of the pairs of lower girdle facets 38A.

Each corresponding pair of candle facets 34B are disposed at the same location along the major axis A₁, on either side of the minor axis A₂. Thus, a first candle facet 34B is disposed to the right of the major axis A₁, in the first quadrant 31A. A second candle facet 34B is disposed to the left of the major axis A₁, in the second quadrant 31B. A third candle facet 34B is disposed to the left of the major axis A₁, in the third quadrant 31C. Moreover, a fourth candle facet 34B is disposed to the right of the major axis A₁, in the fourth quadrant 31D.

The candle facets 34B are positioned generally closer to the minor axis A₂relative to the candle facets 34A, and the candle facets 34A are positioned generally closer to the pointed ends relative to the candle facets 34A. As noted above, the candle facets 34B have a larger horizontal component (relative to the plane of FIG. 3) than vertical component. Each candle facet 34B is generally positioned between one of the culet-adjacent facets 32B, one of the culet-adjacent facets 32C, one of the main pavilion facets 36B, one of the main pavilion facets 36C, and one of the pairs of lower girdle facets 38B. A lower portion of each of the candle facets 34B extends between one of the culet-adjacent facets 32B and one of the culet-adjacent facets 32C. An upper portion of each of the candle facets 34B extends between the two lower girdle facets 38B of one of the pairs of lower girdle facets 38B.

While all of the candle facets 34A-34B have generally the same six-sided shape with pointed upper and lower ends, in some implementations their shapes are all slightly different due to the elongated shape of the pointed ends 33A, 33B of the pavilion 30. The distance between the upper and lower vertices of the candle facets 34A is generally larger than the distance between the upper and lower vertices of either of the candle facets 34B. In some implementations, the upper and lower vertices of any of the candle facets 34A-34B are shifted relative to each other. In these implementations, for any shifted candle facet of the candle facets 34A-34B, the angle bisectors of the upper vertex and the lower vertex are not coincident. Thus, the shapes of the candle facets 34A-34B can vary depending on their location along the pavilion 30. However, in other implementations, any one of the groups of candle facets 34A-34B can have the same size and shape as any of the other groups of candle facets 34A-34B.

FIG. 4A illustrates a perspective view of gemstone 1 at a downward angle, while FIG. 4B illustrates a perspective view of gemstone 1 at an upward angle. These figures show the table 12, the star facets 14A-14C, the upper intermediate crown facets 16A-16C, the lower intermediate crown facets 18A-18B, The main crown facets 20A-20C, the upper girdle facets 22A-22B, the culet-adjacent facets 32A-32C, the candle facets 34A-34B, the main pavilion facets 36A-36C, the lower girdle facets 38A-38B, and the girdle 50.

Referring now to FIGS. 5A-5F, the steps for forming the crown of the gemstone are illustrated. As used in relation to FIGS. 5A-5F, the major axis A₁and the minor axis A₂have the same orientations relative to the gemstone as gemstone 1 in FIGS. 2 and 3, but are not shown. Thus, in FIGS. 5A-5F, the major axis A₁extends vertically through the two pointed ends of the gemstone relative to the plane of the figures, while the minor axis A₂extends horizontally relative to the plane of the figures. Generally, the gemstone may be formed from an uncut sample, which can have any shape. Accordingly, any number of pre-processing steps may be taken to arrive at a substrate 500 with the shape shown in FIG. 5A.

Looking to FIGS. 5A-5B, the first step includes forming (e.g., cutting) a first preliminary table 101A and a first set of crown facets 104A, 104B, and 104C. The first set of crown facets 104A-104C forms a first temporary set of crown facets. Generally, the width of the first preliminary table 101A is formed to be larger than the width of the table 12 of the final gemstone, and thus can be between about 21.0 percent and about 51.0 percent of the width of the gemstone. However, the first preliminary table 101A can be formed with a larger width as well. It should be noted that the various facets included herein may be formed (e.g., cut) using any desired processes. For example, facets in some implementations are formed by griding portions of the gemstone substrate to form a smooth, flat surface that forms the facet. In other implementations, other processes and/or mechanisms may be used to actually form the various facets, e.g., as would be appreciated by one skilled in the art. For example, one or more lasers may be used to modify (e.g., reshape) the gemstone such that the facets are formed.

Portions of the facets of the first set of crown facets 104A, 104B, and 104C will form the main crown facets 20A, 20B, 20C of the final gemstone. Thus, any of the facets in the first set of crown facets 104A, 104B, and 104C can be formed at the desired angle of the main crown facets 20A, 20B, 20C, e.g., such as between about 28° and about 48°, between about 25° and about 50°, between about 35° and about 55°, or about 45°.

The angle of the first set of crown facets 104A-104C and the angles of subsequent crown facets formed in subsequent steps are measured relative to the horizontal plane that is defined by the first preliminary table 101A, similar to how the angles of the facets of the completed crown were measured in FIGS. 1A and 1B. It follows that after this step, the crown of the gemstone includes the first preliminary table 101A and the first set of crown facets 104A-104C.

The next step is shown in FIG. 5C. Here, a second set of crown facets 106A and 106B is formed on the crown of the gemstone. The second set of crown facets 106A and 106B forms a second temporary set of crown facets. The second set of crown facets 106A and 106B is formed by carving a pentagonal surface out of portions of the first preliminary table 102A, and the first set of crown facets 104A-104C.

Portions of the facets of the second set of crown facets 106A, 106B will form the lower intermediate crown facets 18A, 18B of the final gemstone. Thus, the facets of the second set of crown facets 106A, 106B can be formed at the desired angle of the lower intermediate crown facets 18A, 18B, e.g., such as between about 20° and about 36°, between about 15° and about 40°, between about 28° and about 36°, or about 30°.

The gemstone after this step is thus left with a second preliminary table 101B, the second set of crown facets 106A and 106B, and a third set of crown facets 108A-108C (e.g., a third temporary set of crown facets). The second preliminary table 101B is formed from the remainder of the first preliminary table 101A, and is generally horizontal. The third set of crown facets 108A is formed from the remainder of the first set of crown facets 104A, and is formed at the same or similar angle. The third set of crown facets 108B is formed from the remainder of the first set of crown facets 104B, and is formed at the same or similar angle. The third set of crown facets 108C is formed from the remainder of the first set of crown facets 104C, and is formed at the same or similar angle.

The next step is shown in FIG. 5C. Here, a fourth set of crown facets 110A, 110B, 110C is formed on the crown of the gemstone. The fourth crown facets 110A, 110B, 110C form a fourth temporary set of crown facets. The fourth set of crown facets 110A, 110B, 110C is formed by carving out pentagonal-shaped portions from the second preliminary table 101B and the second set of crown facets 106A-106B.

Portions of the facets of the fourth set of crown facets 110A, 110B, 110C will form the upper intermediate crown facets 16A, 16B, and 16C of the final gemstone. Thus, the facets of the fourth set of crown facets 110A, 110B, 110C can be formed at the desired angle of the upper intermediate crown facets 16A, 16B, and 16C, e.g., such as between about 8° and about 25°, between about 8° and about 30°, between about 17° and about 22°, or about 19.5°.

The gemstone after this step is left with a third preliminary table 101C, the third set of crown facets 108A-108C, the fourth set of crown facets 110A-110B, and a fifth set of crown facets 112A-112B (e.g., a first final set of crown facets). The third preliminary table 101C is formed from the remainder of the second preliminary table 101B. The fifth set of crown facets 112A-112B is formed from the remainder of the second set of crown facets 106A, and is formed at the same angle. The fifth set of crown facets 112B is formed from the remainder of the second set of crown facets 106A, 106B, and is formed at the same angle. The fifth set of crown facets 112A, 112B correspond to the respective lower intermediate crown facets 18A, 18B of the final gemstone.

The next step is shown in FIG. 5E. Here, a sixth set of crown facets 114A, 114B is formed on the crown of the gemstone. The sixth set of crown facets 114A, 114B forms a second final set of crown facets (e.g., see 22A, 22B of FIGS. 1A-1B). The sixth set of crown facets 114A, 114B is formed by carving out triangular-shaped portions from the third set of crown facets 108A-108C. Again, the sixth set of crown facets 114A, 114B corresponds to the upper girdle facets 22A-22B of the final gemstone. Thus, the facets of the sixth set of crown facets 114A, 114B can be formed at the desired angle of the upper girdle facets 22A-22B, such as between about 48° and about 60°, between about 43° and about 60°, between about 40° and about 54°, or about 52°.

The gemstone after this step is left with a third preliminary table 101C, the fourth set of crown facets 110A-110C, the fifth set of crown facets 112A-112B, the sixth set of crown facets 114A, 114B, 114C, and a seventh set of crown facets 116A-116B (e.g., a third final set of crown facets). The seventh set of crown facets 116A is formed from the remainder of the third set of crown facets 108A, and is formed at the same angle. The seventh set of crown facets 116B is formed from the remainder of the third set of crown facets 108B, and is formed at the same angle. The seventh set of crown facets 116A corresponds to the main crown facets 22A of the final gemstone, while seventh set of crown facets 116B corresponds to the main crown facets 22B of the final gemstone.

The final step is shown in FIG. 5F. Here, an eighth set of crown facets 118A, 118B is formed on the crown of the gemstone. The eighth set of crown facets 118A, 118B forms a fourth final set of crown facets. The eighth set of crown facets 1118A, 118B is formed by carving out triangular-shaped portions from the third preliminary table 101C and the fourth set of crown facets 110A, 110B, 110C. The eighth set of crown facets 118A, 118B corresponds to the star facets 14A-14B of the final gemstone. Thus, the facets of the eighth set of crown facets 118A, 118B can be formed at the desired angle of the star facets 14A-14B, such as between about 6° and about 18°, between about 3° and about 20°, or about 13°.

The gemstone after this step is left with a final table 102, the fifth set of crown facets 112A-112B, the sixth set of crown facets 114A, 114B, 114C, the seventh set of crown facets 116A-116B, the eighth set of crown facets 118A, 118B, and a ninth set of crown facets 120A, 120B, 120C (e.g., a fifth final set of crown facets). The ninth set of crown facets 120A, 120B, 120C is formed from the remainder of the fourth set of crown facets 110A, 110B, 110C, and are formed at the same angle. The ninth set of crown facets 120A, 120B, 120C corresponds to the upper intermediate crown facets 16A, 16B, 16C of the gemstone 1 illustrated in FIGS. 1A-1B above.

As shown in FIG. 5F, the remaining sets of facets on the crown (e.g., the first, second, third, fourth, and fifth final sets of crown facets) also correspond to the facets on the finished crown in FIGS. 1A, 1B, and 2. The fifth set of crown facets 112A and 112B corresponds to the lower intermediate crown facets 18A, 18B. The sixth set of crown facets 114A, 114B, 114C corresponds to the upper girdle facets 120A, 120B, 120C. The seventh set of crown facets 116A-116B corresponds to the main crown facets 22A-22B. The eighth set of crown facets 118A, 118B corresponds to the star facets 14A, 14B. The ninth set of crown facets 120A, 120B, 120C corresponds to the upper intermediate crown facets 16A-16C.

Referring now to FIGS. 6A-6D, the steps for forming the pavilion of the gemstone are illustrated. As used in relation to FIGS. 6A-6D, the major axis A₁and the minor axis A₂have the same orientations relative to the gemstone as gemstone 1 in FIGS. 2 and 3, but are not shown. Thus, in FIGS. 6A-6D, the major axis A₁extends vertically relative to the plane of the figures (i.e., through the pointed ends of the gemstone), while the minor axis A₂extends horizontally relative to the plane of the figures.

As shown in FIG. 6A, the first step includes forming a first set of pavilion facets 202A-202C by carving out generally triangular portions from the surface of the pavilion. The first set of pavilion facets 202A-202C forms a first temporary set of pavilion facets. In the illustrated implementation, the first set of pavilion facets 202A-202C form a flat lower facet 201A called a culet, which is generally located in the center of the pavilion. The culet 201A can remain or be further carved or formed in subsequent steps, depending on the design of the gemstone. In other implementations, forming the first set of pavilion facets 202A-202C forms a lower point.

Portions of the facets of the first set of pavilion facets 202A will form the main pavilion facets 36A of the final gemstone. Similarly, portions of the remaining facets of the first set of pavilion facets 202B, 202C will form the main pavilion facets 36B, 36C respectively, of the final gemstone Thus, the facets of the first set of pavilion facets 202A, 202B, 202C can be formed at the desired angle of the main pavilion facets 36A, 36B, 36C, such as between about 25° and about 48°, between about 25° and about 50°, between about 34° and about 44°, between about 40° and about 50°, or about 36°.

The angle of the first set of pavilion facets 202A-202C, and the angles of subsequent pavilion facets formed in subsequent steps are measured relative to the horizontal plane that is defined by the preliminary tables 101A, 101B, and 101C, as well as the final table 102 shown in FIGS. 5A-5F, e.g., similar to how the angles of the facets of the completed pavilion are shown as being measured by the angular legends in FIGS. 1A and 1B. After this step, the pavilion of the gemstone includes the first set of pavilion facets 202A-202C.

As shown in FIG. 6B, the second step includes forming a second set of pavilion facets 204A, 204B, 204C by carving triangular-shaped portions from the first set of pavilion facets 202A-202C and the culet 201A. The second set of pavilion facets 204A, 204B, 204C forms a second temporary set of pavilion facets. As shown, the second set of pavilion facets 204A, 204B, 204C form a lower point 201B, which remains as part of the pavilion in the steps shown in FIG. 6C and FIG. 6D.

Portions of the facets of the second set of pavilion facets 204A, 204B, 204C will form the culet-adjacent facets 32A-32C of the final gemstone. Thus, the facets of the second set of pavilion facets 204A, 204B, 204C can be formed at the desired angle of the culet-adjacent facets 32A-32C, such as between about 23° and about 29°, between about 20° and about 33°, between about 16° and about 45°, or about 28.5°. The gemstone after this step is thus left with the second set of pavilion facets 204A, 204B, 204C, and a third set of pavilion facets 206A-206C (e.g., a third temporary set of pavilion facets). The third set of pavilion facets 206A-206C is formed from the remainder of the first set of pavilion facets 202A, 202B, 202C, and is formed at the same angle.

As shown in FIG. 6C, the third step includes forming a fourth set of pavilion facets 208A-208B by carving portions from the second set of pavilion facets 204A-204C and the third set of pavilion facets 206A-206C. The carved-out portions are generally rectangular with a pointed lower end. The fourth set of pavilion facets 208A-208B forms a fourth temporary set of pavilion facets. Again, the fourth set of pavilion facets 208A-208B is formed from portions of the second set of pavilion facets 204A-204C, and the third set of pavilion facets 206A-206C, e.g., as shown. Specifically, the fourth set of pavilion facets 208B is formed from portions of the second set of pavilion facets 204B, 204C, as well as the third set of pavilion facets 206B, 206C. The fourth set of pavilion facets 208A is formed from portions of the second set of pavilion facets 204B, 204A, as well as the third set of pavilion facets 206B, 206A.

Portions of the facets of the fourth set of pavilion facets 208A, 208B will form the respective candle facets 34A, 34B of the final gemstone. Thus, the facets of the fourth set of pavilion facets 208A, 208B can be formed at the desired angle of the candle facets 34A, 34B, e.g., such as between about 25° and about 44°, between about 30° and about 46°, between about 22° and about 50°, or about 34°.

The gemstone after this step is thus left with the fourth set of pavilion facets 208A-208B, a fifth set of pavilion facets 210A, 210B, 210C (e.g., a first final set of pavilion facets), and a sixth set of pavilion facets 212A-212E (e.g., a fifth temporary set of pavilion facets). The fifth set of pavilion facets 210A, 210B, 210C is formed from the remainder of the second set of pavilion facets 204A, 204B, 204C, and is thus formed at the same angle. The fifth set of pavilion facets 210A, 210B, 210C corresponds to the culet-adjacent facets 32A-32C of the final gemstone, e.g., as seen in FIGS. 1A-1B.

The sixth set of pavilion facets 212A, 212B, 212C is formed from the respective remainder of the third set of pavilion facets 206A, 206B, 206C. The each of the facets in sixth set of pavilion facets 212A, 212B, 212C may thereby be formed having a same angle as the respective facets in the third set of pavilion facets 206A, 206B, 206C.

Looking now to FIG. 6D, the final step includes forming a seventh set of pavilion facets 214A, 214B by carving portions from the fourth set of pavilion facets 208A-208B and the sixth set of pavilion facets 212A-212C. The seventh set of pavilion facets 214A, 214B forms a second final set of pavilion facets. The seventh set of pavilion facets 214A, 214B corresponds to the lower girdle facets 38A-38B of the final gemstone. Thus, the facets of the seventh set of pavilion facets 214A, 214B can be formed at the desired angle of the lower girdle facets 38A-38B, e.g., such as between about 42° and about 54°, between about 36° and about 50°, between about 40° and about 50°, between about 35° and about 60°, between about 28° and about 50°, or about 45°.

The gemstone after this step is thus left with the fifth set of pavilion facets 210A-210C, the seventh set of pavilion facets 214A, 214B, an eighth set of pavilion facets 216A-216B (e.g., a third final set of pavilion facets), and a ninth set of pavilion facets 218A, 218B, 218C (e.g., a fourth final set of pavilion facets).

The eighth set of pavilion facets 216A, 216B is formed from the remainder of the fourth set of pavilion facets 208A, 208B, and is formed at the same angle. It follows that the eighth set of pavilion facets corresponds to the candle facets 34A, 34B of the final gemstone (e.g., as seen in FIGS. 1A-1B). Moreover, the ninth set of pavilion facets 218A, 218B, 218C is formed from the remainder of the respective ones of the sixth set of pavilion facets 212A, 212B, 212C, and may thereby have a same or at least similar angle.

As shown in FIG. 6D, the remaining set of facets on the pavilion (e.g., the first, second, third, and fourth final sets of pavilion facets) correspond to the facets on the finished pavilion in FIGS. 1A, 1B, and 3. For instance, the fifth set of pavilion facets 210A-210C corresponds to the culet-adjacent facets 32A-32C. The seventh set of pavilion facets 214A, 214B corresponds to the lower girdle facets 38A, 38B. The eighth set of pavilion facets 216A, 216B corresponds to the candle facets 34A, 34B. The ninth set of pavilion facets 218A-218C corresponds to the main pavilion facets 36A-36C.

Thus, a gemstone having a crown, a girdle, and a pavilion are thus formed. The crown and the pavilion comprise a number of sets of interlocking facets that share edges and vertices on the surface of the gemstone. Each of the sets of interlocking facets is disposed at a specific angle. The shape of the facets, the organization of the facets, and the angles that the facets are formed at on the surface of the gemstone result in a gemstone having improved performance.

As noted above, gemstones having the number, arrangement, size, orientation, etc. of facets described in implementations herein achieve improved performance in comparison to conventional gemstones having a similar elongated fancy shape, e.g., such as the Marquise tapered elliptical shape. More specifically, at least some of the implementations herein are able to eliminate internal shadowing experienced by the conventional gemstones. To accomplish this, over a decade was spent refining and testing performance (e.g., brilliance, sparkle, etc.) of gemstones having unique combinations of numbers, arrangements, sizes, orientations, etc., of facets. This resulted in achieving an elongated fancy shape gemstone that performed more desirably than had been conventionally achievable. However, the specific combination of facet sizes, orientations, shapes, etc. that removed the shadowing experienced in conventional gemstones was surprising and took years to develop. It follows that the facets included in the implementations herein increase the amount of light reflecting off of the internal surfaces of the facets, thus increasing the performance of the gemstone as a whole.

One or more elements or aspects or steps, or any portion(s) thereof, from one or more of any of claims or Alternative Implementations below can be combined with one or more elements or aspects or steps, or any portion(s) thereof, from one or more of any of the other claims or Alternative Implementations or combinations thereof, to form one or more additional implementations and/or claims of the present disclosure.

ALTERNATIVE IMPLEMENTATIONS

Alternative Implementation 1. A gemstone comprising: a girdle defining a perimeter of the gemstone, the girdle having an elongated elliptical-shaped cross-section, the elliptical-shaped cross-section having a first pointed end and a second pointed end opposing the first pointed end; a crown forming an upper portion of the gemstone, a surface of the crown including: a table forming a generally horizontal upper surface of the crown; a plurality of star facets, each of the plurality of star facets being disposed adjacent to and abutting an edge of the table; a plurality of upper intermediate crown facets, each of the plurality of upper intermediate crown facets being disposed generally between two of the plurality of star facets, an upper vertex of each of the plurality of upper intermediate crown facets abutting a vertex of the table; a plurality of lower intermediate crown facets, each of the plurality of lower intermediate crown facets being disposed generally between two of the plurality of upper intermediate crown facets, an upper vertex of each of the plurality of lower intermediate crown facets abutting a lower vertex of one of the plurality of star facets; a plurality of main crown facets, each of the plurality of main crown facets being disposed generally between two of the plurality of lower intermediate crown facets, an upper vertex of each of the plurality of main crown facets abutting a lower vertex of one of the plurality of lower intermediate crown facets; and a plurality of upper girdle facets formed in pairs of adjacent upper girdle facets, each pair of adjacent upper girdle facets being disposed generally between two of the plurality of main crown facets, upper vertices of both upper girdle facets in each pair of upper girdle facets abutting a lower vertex of one of the plurality of lower intermediate crown facets; and a pavilion forming a lower portion of the gemstone, a surface of the pavilion including: a plurality of culet-adjacent facets forming a lower point of the pavilion; a plurality of candle facets, a lower portion of each of the plurality of candle facets being disposed generally between two of the plurality of culet-adjacent facets; a plurality of main pavilion facets, each of the main pavilion facets being disposed between two of the plurality of candle facets, a lower edge of each of the plurality of main pavilion facets abutting an upper edge of one of the plurality of culet-adjacent facets; and a plurality of lower girdle facets formed in pairs of adjacent lower girdle facets, each pair of adjacent lower girdle facets being disposed generally between two of the plurality of main pavilion facets, each pair of adjacent lower girdle facets having an upper portion of a respective one of the plurality of candle facets disposed generally therebetween; and wherein the girdle is positioned between the crown and the pavilion, each of the plurality of upper girdle facets being disposed adjacent to and abutting an upper edge of the girdle, and each of the plurality of lower girdle facets being disposed adjacent to and abutting a lower edge of the girdle.

Alternative Implementation 2. The gemstone of Alternative Implementation 1, wherein the gemstone has a table percentage between about 20 percent and about 34 percent.

Alternative Implementation 3. The gemstone of Alternative Implementation 1, wherein the gemstone has a top depth percentage between about 15 percent and about 35 percent.

Alternative Implementation 4. The gemstone of Alternative Implementation 1, wherein the gemstone has a bottom depth percentage between about 35 percent and about 40 percent.

Alternative Implementation 5. The gemstone of Alternative Implementation 1, wherein the gemstone has a total depth percentage between about 85 percent and about 95 percent.

Alternative Implementation 6. The gemstone of Alternative Implementation 1, wherein the gemstone has a girdle thickness percentage between about 5 percent and about 15 percent.

Alternative Implementation 7. The gemstone of Alternative Implementation 1, wherein a horizontal plane is defined by the table of the gemstone, and wherein each of the plurality of star facets is disposed at a first angle relative to the horizontal plane, each of the plurality of upper intermediate crown facets is disposed at a second angle relative to the horizontal plane, each of the plurality of lower intermediate crown facets is disposed at a third angle relative to the horizontal plane, each of the plurality of main crown facets is disposed at a fourth angle relative to the horizontal plane, and each of the plurality of upper girdle facets is disposed at a fifth angle relative to the horizontal plane.

Alternative Implementation 8. The gemstone of Alternative Implementation 7, wherein first angle is between about 6° and about 18°.

Alternative Implementation 9. The gemstone of Alternative Implementation 7, wherein the second angle is between about 8° and about 15°, between about 17° and about 25°, or both.

Alternative Implementation 10. The gemstone of Alternative Implementation 7, wherein the third angle is between about 20° and about 30°, between about 28° and about 36°, or both.

Alternative Implementation 11. The gemstone of Alternative Implementation 7, wherein the fourth angle is between about 28° and about 36°, between about 43° and about 50°, between about 39° and about 48°, or combinations thereof.

Alternative Implementation 12. The gemstone of Alternative Implementation 11, wherein the plurality of main crown facets includes a first set of main crown facets disposed at an angle of between about 28° and about 36°, a second set of main crown facets disposed at an angle of between about 43° and about 50°, and a third set of main crown facets disposed at an angle of about 39° and about 48°.

Alternative Implementation 13. The gemstone of Alternative Implementation 7, wherein the fifth angle is between about 48° and about 60°.

Alternative Implementation 14. The gemstone of Alternative Implementation 1, wherein a horizontal plane is defined by the table of the gemstone, and wherein each of plurality of culet-adjacent facets is disposed at a first angle relative to the horizontal plane, each of plurality of candle facets is disposed at a second angle relative to the horizontal plane, each of plurality of main pavilion facets is disposed at a third angle relative to the horizontal plane, and each of the plurality of lower girdle facets is disposed at a fourth angle relative to the horizontal plane.

Alternative Implementation 15. The gemstone of Alternative Implementation 14, wherein the first angle is between about 23° and about 29°.

Alternative Implementation 16. The gemstone of Alternative Implementation 14, wherein second angle is between about 25° and about 35°, between about 38° and about 44°, or both.

Alternative Implementation 17. The gemstone of Alternative Implementation 16, wherein the plurality of candle facets includes a first set of candle facets disposed at an angle of between about 25° and about 35°, and a second set of candle facets disposed at an angle of between about 38° and about 44°.

Alternative Implementation 18. The gemstone of Alternative Implementation 14, wherein the third angle is between about 25° and about 35°, between about 35° and about 45°, between about 42° and about 48°, or combinations thereof.

Alternative Implementation 19. The gemstone of Alternative Implementation 18, wherein the plurality of main pavilion facets includes a first set of main pavilion facets disposed at an angle of between about 25° and about 35°, a second set of main pavilion facets disposed at an angle of between about 35° and about 45°, and a third set of main pavilion facets disposed at an angle of between about 42° and about 48°.

Alternative Implementation 20. The gemstone of Alternative Implementation 14, wherein the fourth angle is between about 36° and about 50°.

Alternative Implementation 21. The gemstone of Alternative Implementation 1, wherein the first and second pointed ends have a same profile.

Alternative Implementation 22. The gemstone of Alternative Implementation 1, wherein the elliptical-shaped cross-section is symmetric across a first axis an extending between the first and second pointed ends, and wherein the elliptical-shaped cross-section is symmetric across a second axis that is perpendicular to the first axis.

Alternative Implementation 23. A gemstone comprising: a girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section; and a crown forming an upper portion of the gemstone, a surface of the crown including: a table forming a generally horizontal upper surface of the crown; a plurality of star facets, each of the plurality of star facets being disposed adjacent to and abutting an edge of the table; a plurality of upper intermediate crown facets, each of the plurality of upper intermediate crown facets being disposed generally between two of the plurality of star facets, an upper vertex of each of the plurality of upper intermediate crown facets abutting a vertex of the table; a plurality of lower intermediate crown facets, each of the plurality of lower intermediate crown facets being disposed generally between two of the plurality of upper intermediate crown facets, an upper vertex of each of the plurality of lower intermediate crown facets abutting a lower vertex of one of the plurality of star facets; a plurality of main crown facets, each of the plurality of main crown facets being disposed generally between two of the plurality of lower intermediate crown facets, an upper vertex of each of the plurality of main crown facets abutting a lower vertex of one of the plurality of lower intermediate crown facets; and a plurality of upper girdle facets formed in pairs of adjacent upper girdle facets, each pair of adjacent upper girdle facets being disposed generally between two of the plurality of main crown facets, upper vertices of both upper girdle facets in each pair of upper girdle facets abutting a lower vertex of one of the plurality of lower intermediate crown facets.

Alternative Implementation 24. A gemstone comprising: a girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section; and a pavilion forming a lower portion of the gemstone, a surface of the pavilion including: a plurality of culet-adjacent facets forming a lower point of the pavilion; a plurality of candle facets, a lower portion of each of the plurality of candle facets being disposed generally between two of the plurality of culet-adjacent facets; a plurality of main pavilion facets, each of the main pavilion facets being disposed between two of the plurality of candle facets, a lower edge of each of the plurality of main pavilion facets abutting an upper edge of one of the plurality of culet-adjacent facets; and a plurality of lower girdle facets formed in pairs of adjacent lower girdle facets, each pair of adjacent lower girdle facets being disposed generally between two of the plurality of main pavilion facets, each pair of adjacent lower girdle facets having an upper portion of a respective one of the plurality of candle facets disposed generally therebetween.

Alternative Implementation 25. A gemstone comprising: a girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section; a crown forming an upper portion of the gemstone, a surface of the crown including: a table forming a generally horizontal upper surface of the crown, the table having a generally octagonal shape; a plurality of star facets disposed adjacent to the table, each of the plurality of star facets being triangle-shaped; a plurality of upper intermediate crown facets disposed adjacent to the plurality of star facets, each of the plurality of upper intermediate crown facets being kite-shaped; a plurality of lower intermediate crown facets disposed adjacent to the plurality of upper intermediate crown facets, each of the plurality of lower intermediate crown facets being kite-shaped; a plurality of main crown facets disposed adjacent to the plurality of lower intermediate crown facets, each of the plurality of main crown facets being kite-shaped; and a plurality of upper girdle facets disposed adjacent to the plurality of main crown facets, each of the plurality of upper girdle facets being triangle-shaped; and a pavilion forming a lower portion of the gemstone, a surface of the pavilion including: a plurality of culet-adjacent facets forming a lower point of the pavilion, each of the plurality of culet-adjacent facets having a generally pentagonal shape; a plurality of candle facets disposed adjacent to the plurality of culet-adjacent facets, each of the plurality of candle facets having six edges; a plurality of main pavilion facets, each of the main pavilion facets being disposed between two of the plurality of candle facets and having a generally pentagonal shape; and a plurality of lower girdle facets formed in pairs of adjacent lower girdle facets, each pair of adjacent lower girdle facets being disposed generally between two of the plurality of main pavilion facets, each lower girdle facet having four edges; and wherein the girdle is positioned between the crown and the pavilion, each of the plurality of upper girdle facets being disposed adjacent to and abutting an upper edge of the girdle, and each of the plurality of lower girdle facets being disposed adjacent to and abutting a lower edge of the girdle.

Alternative Implementation 26. A gemstone comprising: a crown forming an upper portion of the gemstone; a pavilion forming a lower portion of the gemstone; and a girdle positioned between the crown and the pavilion and encircling the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end, wherein the gemstone has a top depth percentage between about 15 percent and about 35 percent, and a bottom depth percentage between about 35 percent and about 40 percent.

Alternative Implementation 27. The gemstone of Alternative Implementation 26, wherein the gemstone has a total depth percentage between about 85 percent and about 95 percent.

Alternative Implementation 28. The gemstone of Alternative Implementation 26, wherein the gemstone has a table percentage between about 20 percent and about 34 percent.

Alternative Implementation 29. The gemstone of Alternative Implementation 26, wherein the gemstone has a girdle thickness percentage between about 5 percent and about 15 percent.

Alternative Implementation 30. A gemstone comprising: a crown forming an upper portion of the gemstone; a pavilion forming a lower portion of the gemstone; and a girdle positioned between the crown and the pavilion and encircling the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end, wherein the gemstone has a total depth percentage between about 85 percent and about 95 percent.

Alternative Implementation 31. A gemstone comprising: a crown forming an upper portion of the gemstone, a surface of the crown including a first plurality of facets, each of the first plurality of facets being disposed at an angle between about 6° and about 60° relative to an upper surface of the gemstone; a pavilion forming a lower portion of the gemstone, a surface of the pavilion including a second plurality of facets, each of the second plurality of facets being disposed at an angle between about 23° and about 50° relative to the upper surface of the gemstone; and a girdle positioned between the crown and the pavilion and encircling the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end.

Alternative Implementation 32. A gemstone comprising: a crown forming an upper portion of the gemstone; a pavilion forming a lower portion of the gemstone; and a girdle positioned between the crown and the pavilion and encircling the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end, wherein the gemstone has a table percentage between about 20 percent and about 34 percent, and a girdle thickness percentage between about 5 percent and about 15 percent.

Alternative Implementation 33. A method of forming a crown of a gemstone, comprising: cutting a generally horizontal upper surface on an upper portion of the gemstone; cutting a first temporary set of crown facets, the first temporary set of crown facets being formed at an angle of between about 28° and about 50° relative to the generally horizontal upper surface; cutting a second temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the first temporary set of crown facets, the second temporary set of crown facets being formed at an angle of between about 20° and about 36° relative to the generally horizontal upper surface, a remainder of the first temporary set of crown facets forming a third temporary set of crown facets; cutting a fourth temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the second temporary set of crown facets, the fourth temporary set of crown facets being formed at an angle of between about 8° and about 25° relative to the generally horizontal upper surface, a remainder of the second temporary set of crown facets forming a first final set of crown facets; cutting a second final set of crown facets on the upper portion of the gemstone from portions of the third temporary set of crown facets, the second final set of crown facets being formed at an angle of between about 48° and about 60° relative to the generally horizontal upper surface, a remainder of the third temporary set of crown facets forming a third final set of crown facets; and cutting a fourth final set of crown facets on the upper portion of the gemstone from portions of the generally horizontal surface and the fourth temporary set of crown facets, the fifth final set of crown facets being formed at an angle of between about 6° and about 18° relative to the generally horizontal upper surface, a remainder of the fourth temporary set of crown facets forming a fifth final set of crown facets, such that the upper portion of the gemstone is formed from the first, second, third, fourth, and fifth final sets of crown facets.

Alternative Implementation 34. The method of Alternative Implementation 33, further comprising forming a girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end.

Alternative Implementation 35. A method of forming a pavilion of a gemstone having a horizontal upper surface, comprising: cutting a first temporary set of pavilion facets, the first temporary set of pavilion facets being formed at an angle of between about 25° and about 48° relative to the horizontal upper surface, the first temporary set of facets forming a lower point; cutting a second temporary set of pavilion facets on the lower portion of the gemstone from portions of the first temporary set of pavilion facets, the second temporary set of facets being formed at an angle of between about 23° and about 29° relative to the horizontal upper surface, a remainder of the first temporary set of pavilion facets forming a third temporary set of pavilion facets; cutting a fourth temporary set of pavilion facets on the lower portion of the gemstone from portions of the second temporary set of pavilion facets and the third temporary set of pavilion facets, the fourth temporary pavilion facets being formed at an angle of between about 25° and about 44° relative to the horizontal upper surface, a remainder of the second temporary set of pavilion facets forming a first final set of pavilion facets, a remainder of the third temporary set of pavilion facets forming a fifth temporary set of pavilion facets; and cutting a second final set of pavilion facets on the lower portion of the gemstone from portions of the fourth temporary set of pavilion facets and the fifth temporary set of pavilion facets, the second final set of pavilion facets being formed at an angle of between about 36° and about 50°, a remainder of the fourth temporary set of pavilion facets forming a third final set of pavilion facets, a remainder of the fifth temporary set of pavilion facets forming a fourth final set of pavilion facets, such that the lower portion of the gemstone is formed from the first, second, third, and fourth final sets of pavilion facets.

Alternative Implementation 36. The method of Alternative Implementation 35, further comprising cutting a girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end.

Alternative Implementation 37. A method of forming a gemstone having a crown, a girdle, and a pavilion, the method comprising: creating the crown of the gemstone, by: cutting a generally horizontal upper surface on an upper portion of the gemstone; cutting a first temporary set of crown facets, the first temporary set of crown facets being formed at an angle of between about 28° and about 50° relative to the generally horizontal upper surface; cutting a second temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the first temporary set of crown facets, the second temporary set of crown facets being formed at an angle of between about 20° and about 36° relative to the generally horizontal upper surface, a remainder of the first temporary set of crown facets forming a third temporary set of crown facets; cutting a fourth temporary set of crown facets on the upper portion of the gemstone from portions of the generally horizontal upper surface and the second temporary set of crown facets, the fourth temporary set of crown facets being formed at an angle of between about 8° and about 25° relative to the generally horizontal upper surface, a remainder of the second temporary set of crown facets forming a first final set of crown facets; cutting a second final set of crown facets on the upper portion of the gemstone from portions of the third temporary set of crown facets, the second final set of crown facets being formed at an angle of between about 48° and about 60° relative to the generally horizontal upper surface, a remainder of the third temporary set of crown facets forming a third final set of crown facets; and cutting a fourth final set of crown facets on the upper portion of the gemstone from portions of the generally horizontal surface and the fourth temporary set of crown facets, the fifth final set of crown facets being formed at an angle of between about 6° and about 18° relative to the generally horizontal upper surface, a remainder of the fourth temporary set of crown facets forming a fifth final set of crown facets, such that the upper portion of the gemstone is formed from the first, second, third, fourth, and fifth final sets of crown facets; creating the pavilion of the gemstone, by: cutting a first temporary set of pavilion facets, the first temporary set of pavilion facets being formed at an angle of between about 25° and about 48° relative to the horizontal upper surface, the first temporary set of facets forming a lower point; cutting a second temporary set of pavilion facets on the lower portion of the gemstone from portions of the first temporary set of pavilion facets, the second temporary set of facets being formed at an angle of between about 23° and about 29° relative to the horizontal upper surface, a remainder of the first temporary set of pavilion facets forming a third temporary set of pavilion facets; cutting a fourth temporary set of pavilion facets on the lower portion of the gemstone from portions of the second temporary set of pavilion facets and the third temporary set of pavilion facets, the fourth temporary pavilion facets being formed at an angle of between about 25° and about 44° relative to the horizontal upper surface, a remainder of the second temporary set of pavilion facets forming a first final set of pavilion facets, a remainder of the third temporary set of pavilion facets forming a fifth temporary set of pavilion facets; and cutting a second final set of pavilion facets on the lower portion of the gemstone from portions of the fourth temporary set of pavilion facets and the fifth temporary set of pavilion facets, the second final set of pavilion facets being formed at an angle of between about 36° and about 50°, a remainder of the fourth temporary set of pavilion facets forming a third final set of pavilion facets, a remainder of the fifth temporary set of pavilion facets forming a fourth final set of pavilion facets, such that the lower portion of the gemstone is formed from the first, second, third, and fourth final sets of pavilion facets; and creating the girdle defining a perimeter of the gemstone, the girdle having an elliptical-shaped cross-section with a first pointed end and a second pointed end opposing the first pointed end.

While the present disclosure has been described with reference to one or more particular implementations, those skilled in the art will recognize that many changes may be made thereto without departing from the spirit and scope of the present disclosure. Each of these implementations and obvious variations thereof is contemplated as falling within the spirit and scope of the present disclosure. It is also contemplated that additional implementations according to aspects of the present disclosure may combine any number of features from any of the implementations described herein.

GEMSTONE AND METHODS OF CUTTING THE SAME

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CROSS-REFERENCE TO RELATED APPLICATIONS

Provisional Applications (1)