Gemstone Facet Configuration
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.
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.