Precious and Semiprecious Stone Cut
The present invention provides a cut stone including a top surface and a bottom surface and a girdle. The top surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The bottom surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The girdle is disposed between the first facet row of the top surface and the first facet row of the bottom surface.
This application claims the benefit of U.S. Provisional Application No. 60/672,528, filed Apr. 19, 2005, which is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION1. Field of the Invention
This invention relates to precious and semiprecious stones, and, more particularly, to a new and unique gemstone cut.
2. Description of Related Art
The origins of gem cutting, or lapidary, date back to antiquity. Early artisans mastered sawing, chipping, drilling, polishing and even faceting, in materials such as jade, quartz, amber and turquoise. These craftsmen eventually progressed to ruby, sapphire, emerald, garnet and finally diamond, the hardest of gems. While a method of diamond cutting was practiced as early as the fourteenth century in France and developed gradually over the next several hundred years, the modern age of the round, brilliant cut diamond arrived with the publication of Marcel Tolkowsky's “Diamond Design” in 1919 describing the “ideal” proportions for cutting a diamond. Importantly, Tolkowsky's ideal diamond configuration has a well-defined front (i.e., the crown) and back (i.e., the pavilion). Today, variations on Tolkowsky's ideal dimensions include a slightly larger crown table and longer pavilion girdles.
As lapidaries began to apply these new diamond cutting techniques to other precious and semiprecious gemstones, color enhancement, promotion, dramatization, etc., became the predominant goal. Many different cuts have been developed, including stepped designs. However, none provide increased brightness and different brilliant colors to the cut gemstone.
BRIEF SUMMARY OF THE INVENTIONEmbodiments of the present invention provide a cut gemstone including a top surface and a bottom surface and a girdle. The top surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The bottom surface includes a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets. The girdle is disposed between the first facet row of the top surface and the first facet row of the bottom surface.
The above and other advantages of this invention will become more apparent by the following description of invention and the accompanying drawings.
As depicted in
A girdle 106 is disposed between the first facet row 110 of the top surface 102 and the first facet row 150 of the bottom surface 104. The girdle 106 is dimensioned to advantageously increase the brilliance of the gemstone 100. In one embodiment, the girdle 106 is less than 0.6%, generally, while in other embodiments, the girdle may be thin, very thin, extremely thin, etc.
Generally, the top surface 102 and the bottom surface 104 are dome shaped, and neither the top surface 102, nor the bottom surface 104, includes a table. In the preferred embodiment, the top surface 102 and the bottom surface 104 are mirror images of each other. Again, in contrast to other diamond cuts which include a preferred orientation, the symmetric, two-sided cut of the present invention advantageously eliminates a back surface, allowing the gemstone 100 to be seen from many angles.
The various embodiments of the present invention may be incorporated into several different types of jewelry, such as, for example, earrings, necklaces, bracelets, etc., as depicted in
One or more floating settings 504 may be used to mount gemstones 100 within a necklace 500, as stylistically depicted within the top view of
In one embodiment, the gemstone 100 has a depth of about 46%, as depicted in
Generally, the angle formed by the second row of facets 130, 170 is less than the angle formed by the first row of facets 110, 150, and the angle formed by the third row of facets 140, 180 is less than the angle formed by the second row of facets 130, 170. For illustration purposes, in
In the embodiment depicted within
While this invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the preferred embodiments of the invention as set forth herein, are intended to be illustrative, not limiting. Various changes may be made without departing from the true spirit and full scope of the invention as set forth herein.
Claims
1. A cut gemstone, comprising:
- a top surface, including: a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets;
- a bottom surface, including: a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets; and
- a girdle disposed between the first facet row of the top surface and the first facet row of the bottom surface.
2. The cut gemstone of claim 1, wherein the gemstone consists of 60 facets.
3. The cut gemstone of claim 2, wherein the gemstone has a depth of about 46%.
4. The cut gemstone of claim 3, wherein the first facet row forms an angle with respect to the horizontal of about 50°.
5. The cut gemstone of claim 4, wherein the second facet row forms an angle with respect to the horizontal of about 15°.
6. The cut gemstone of claim 5, wherein the third facet row forms an angle with respect to the horizontal between about 10°.
7. The cut gemstone of claim 2, wherein the second facet row forms an angle with respect to the horizontal that is less than an angle formed by the first facet row, and the third facet row forms an angle with respect to the horizontal that is less than the angle formed by the second facet row.
8. The cut gemstone of claim 7, wherein the gemstone has a depth of about 36% to 56%, the first facet row forms an angle with respect to the horizontal of about 38° to 50°, the second facet row forms an angle with respect to the horizontal of about 15° to 25°, and the third facet row forms an angle with respect to the horizontal of between about 5° to 25°.
9. The cut gemstone of claim 1, wherein the top and bottom surfaces are dome-shaped, mirror images.
10. The cut gemstone of claim 1, wherein the stone is selected from a group consisting of a precious stone, a semiprecious stone and a cubic zirconium.
11. The cut gemstone of claim 1, wherein a shape of the stone is selected from the group consisting of round, pear, cushion, marquise and oval.
12. The cut gemstone of claim 1, wherein the girdle is thin, very thin or extremely thin.
13. The cut gemstone of claim 1, wherein the girdle is less than 0.6%.
14. A jewelry piece comprising a cut gemstone mounted in a setting, the cut gemstone including:
- a top surface having a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets;
- a bottom surface having a first facet row having 18 facets, a second facet row having 6 facets, and a third facet row having 6 facets; and
- a girdle disposed between the first facet row of the top surface and the first facet row of the bottom surface.
15. The jewelry piece of claim 14, wherein:
- the gemstone consists of 60 facets,
- the gemstone has a depth of between about 36% to 56%,
- the first facet row forms an angle with respect to the horizontal of between 38° to 50°,
- the second facet row forms an angle with respect to the horizontal smaller than the first facet row and between 15° to 25°, and
- the third facet row forms an angle with respect to the horizontal smaller than the second facet row and between 5° to 25°.
16. The jewelry piece of claim 15, wherein the setting includes a frame encircling the gemstone and at least two pairs of prongs.
17. The jewelry piece of claim 15, wherein the setting is a prong setting, a bezel setting, a bar setting or a channel setting.
18. The jewelry piece of claim 15, wherein the gemstone and the setting are incorporated into an earring, a necklace, a bracelet or a ring.
19. A cut gemstone, comprising:
- a top surface, including: a first facet row having a primary number of facets, a second facet row having a secondary number of facets less than the primary number of facets, and a third facet row having the secondary number of facets;
- a bottom surface, including: a first facet row having the primary number of facets, a second facet row having the secondary number of facets, and a third facet row having the secondary number of facets; and
- a girdle disposed between the first facet row of the top surface and the first facet row of the bottom surface.
20. The cut gemstone of claim 19, wherein the primary number is three times larger than the secondary number.
21. The cut gemstone of claim 20, wherein the primary number is a multiple of 18 and the secondary number is a multiple of 6.
22. A jewelry piece comprising the cut gemstone recited in claim 19.
Type: Application
Filed: Apr 19, 2006
Publication Date: Jun 26, 2008
Inventors: Gerald David Bauman (Los Angeles, CA), Rhonda Maureen Faber-Green (Los Angeles, CA)
Application Number: 11/815,705
International Classification: A44C 17/00 (20060101); A44C 17/02 (20060101); A44C 7/00 (20060101);