Gemstone Facet Configuration

• US 20090056374A1
• Filed: 08/31/2007
• Published: 03/05/2009
• Est. Priority Date: 08/31/2007
• Status: Abandoned Application

• Current Assignee: Charles & Colvard Ltd.
• Original Assignee: Charles & Colvard Ltd.
• Inventors: Abate, Steven L.
• Application Number:
  US11/848,469
• Publication Number:
  US 20090056374A1
• Time in Patent Office: Days
• US Class Current: 63/26
• CPC Class Codes: A44C 17/001 Faceting gems

Abstract

A gemstone can include a crown portion having a table facet, a plurality of trapezoidal facets, a plurality of irregular-hexagonal facets, a plurality of irregular-pentagonal facets, and a plurality of triangular crown-facets. The gemstone can also include a pavilion portion having a plurality of first kite facets, a plurality of irregular-quadrilateral facets, a plurality of second kite facets, and a plurality of triangular pavilion-facets.

Claims

1. A gemstone comprising:

a crown portion having a table facet, a plurality of trapezoidal facets, a plurality of irregular-hexagonal facets, a plurality of irregular-pentagonal facets, and a plurality of triangular crown-facets; and

a pavilion portion having a plurality of first kite facets, a plurality of irregular-quadrilateral facets, a plurality of second kite facets, and a plurality of triangular pavilion-facets.

2. The gemstone of claim 1, wherein the gemstone comprises silicon carbide.

3. The gemstone of claim 1, wherein the gemstone has a refractive index in the range of about 2.50 to about 2.71.

4. The gemstone of claim 1, further including a girdle positioned between the crown and the pavilion.

5. The gemstone of claim 1, wherein the gemstone includes at least one of 4, 6, 8, 10 and 12-fold symmetry.

6. The gemstone of claim 1, wherein at least one of the plurality of trapezoidal facets has a boundary in common with a boundary of the table facet.

7. The gemstone of claim 1, wherein at least one of the plurality of irregular-hexagonal facets has a first boundary in common with a boundary of the table facet and a second boundary in common with the perimeter of the crown.

8. The gemstone of claim 1, wherein at least one of the plurality of irregular-pentagonal facets has a boundary in common with the perimeter of the crown.

9. The gemstone of claim 1, wherein at least two of the plurality of first kite facets have a common boundary.

10. The gemstone of claim 1, wherein at least one of the plurality of irregular-quadrilateral facets has a boundary in common with the perimeter of the pavilion and at least two of the plurality of irregular-quadrilateral facets have a common boundary.

11. The gemstone of claim 1, wherein at least one of the plurality of irregular-pentagonal facets is formed at an angle of about 31°

with the horizontal plane of the gemstone.

12. The gemstone of claim 1, wherein at least one of the plurality of irregular-quadrilateral facets is formed at an angle of about 40°

with the horizontal plane of the gemstone.

13. The gemstone of claim 1, wherein at least one of the plurality of first kite facets is formed at an angle of about 39.5°

with the horizontal plane of the gemstone.

14. A gemstone comprising:

a crown portion having a table facet, a plurality of triangular upper-crown facets, a plurality of four-sided polygonal facets, a plurality of triangular middle-crown facets, and a plurality of triangular lower-crown facets; and

a pavilion portion having a plurality of kite facets, a plurality of irregular-quadrilateral facets, a plurality of five-sided polygonal facets, a plurality of triangular middle-pavilion facets, and a plurality of triangular upper-pavilion facets.

15. The gemstone of claim 14, wherein the gemstone comprises silicon carbide.

16. The gemstone of claim 14, wherein the gemstone has a refractive index in the range of about 2.50 to about 2.71.

17. The gemstone of claim 14, further including a girdle positioned between the crown and the pavilion.

18. The gemstone of claim 14, wherein the gemstone includes at least one of 4, 6, 8, 10 and 12-fold symmetry.

19. The gemstone of claim 14, wherein at least one of the plurality of triangular upper-crown facets has a boundary in common with the table facet.

20. The gemstone of claim 14, wherein at least two of the plurality of triangular middle-crown facets have a common boundary.

21. The gemstone of claim 14, wherein at least two of the plurality of triangular middle-pavilion facets have a common boundary.

22. The gemstone of claim 14, wherein at least one of the plurality of triangular upper-pavilion facets has a boundary in common with the perimeter of the pavilion.

23. The gemstone of claim 14, wherein at least one of the plurality of five-sided polygonal facets has a boundary in common with the perimeter of the pavilion.

24. The gemstone of claim 14, wherein at least one of the plurality of triangular upper-crown facets is formed at an angle of about 23°

with the horizontal plane of the gemstone.

25. The gemstone of claim 14, wherein at least one of the plurality of triangular middle-crown facets is formed at an angle of about 29°

with the horizontal plane of the gemstone.

26. The gemstone of claim 14, wherein at least one of the plurality of triangular upper-pavilion facets is formed at an angle of about 49°

with the horizontal plane of the gemstone.

27. The gemstone of claim 14, wherein at least one of the plurality of triangular middle-pavilion facets is formed at an angle of about 41°

with the horizontal plane of the gemstone.

28. The gemstone of claim 14, wherein at least one of the plurality of five-sided polygonal facets is formed at an angle of about 47°

with the horizontal plane of the gemstone.

29. A method of forming a gemstone, comprising:

growing a single crystal of silicon carbide;

forming a crown portion having a table facet and a plurality of triangular crown-facets; and

forming a pavilion portion having a plurality of kite facets, a plurality of irregular-quadrilateral facets, and a plurality of triangular pavilion-facets.

30. The method of claim 29, wherein growing the single crystal includes using a sublimation process.

31. The method of claim 29, further including selectively doping the single crystal to at least partially color the crystal.

32. The method of claim 29, wherein the single crystal has a crystalline form selected from the group consisting of a 6H structure and a 4H structure.

33. The method of claim 29, wherein the crown portion further includes a plurality of trapezoidal facets, a plurality of irregular-hexagonal facets, and a plurality of irregular-pentagonal facets.

34. The method of claim 33, wherein at least one of the plurality of irregular-pentagonal facets is formed at an angle of about 31°

with the horizontal plane of the gemstone.

35. The method of claim 29, wherein the pavilion portion further includes a plurality of second kite facets.

36. The method of claim 29, wherein at least one of the plurality of irregular-quadrilateral facets is formed at an angle of about 40°

with the horizontal plane of the gemstone.

37. The method of claim 29, wherein at least one of the plurality of kite facets is formed at an angle of about 39.5°

with the horizontal plane of the gemstone.

38. The method of claim 29, wherein the crown portion further includes a plurality of four-sided polygonal facets.

39. The method of claim 29, wherein at least one of the plurality of triangular crown-facets is formed at an angle with the horizontal plane of the gemstone selected from the group consisting of about 23°

and about 29°

.

40. The method of claim 29, wherein the pavilion portion further includes a plurality of five-sided polygonal facets.

41. The method of claim 40, wherein at least one of the plurality of five-sided polygonal facets is formed at an angle of about 47°

with the horizontal plane of the gemstone.

42. The method of claim 29, wherein at least one of the plurality of triangular pavilion-facets is formed at an angle with the horizontal plane of the gemstone selected from the group consisting of about 41°

and about 49°

.

43. An item of jewelry comprising:

a setting configured to support a gemstone, wherein the gemstone comprises silicon carbide and includes;

a crown portion having a table facet and a plurality of triangular crown-facets; and

a pavilion portion having a plurality of kite facets, a plurality of irregular-quadrilateral facets, and a plurality of triangular pavilion-facets.

44. The item of jewelry of claim 43, wherein the setting includes a precious metal selected from the group consisting of gold, silver, and titanium.

45. The item of jewelry of claim 43, wherein the crown portion further includes a plurality of trapezoidal facets, a plurality of irregular-hexagonal facets, and a plurality of irregular-pentagonal facets.

46. The item of jewelry of claim 43, wherein the pavilion portion further includes a plurality of second kite facets.

47. The item of jewelry of claim 43, wherein the crown portion further includes a plurality of four-sided polygonal facets.

48. The item of jewelry of claim 43, wherein the pavilion portion further includes a plurality five-sided polygonal facets.