초록 ▼

A method for producing a diamond includes forming a table lying in a table plane; forming crown facets that are oriented at an angle of between 26° and 35° relative to the table plane; forming upper pavilion (UP) facets below the crown facets at an angle of between 45° and 80° relative to a girdle p

A method for producing a diamond includes forming a table lying in a table plane; forming crown facets that are oriented at an angle of between 26° and 35° relative to the table plane; forming upper pavilion (UP) facets below the crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottoms of the crown facets and tops of the UP facets; and forming a set of lower pavilion (LP) facets between bottoms of the UP facets and the culet at an angle of between 38° and 44° relative to the girdle plane. The UP and LP facets form a rib line positioned between one-fifth and four-fifths the distance between the girdle plane and the culet, such that the UP facets extend between 20% and 80% of the distance between the girdle plane and the culet.

대표청구항 ▼

1. A method of cutting a diamond to obtain a high carat yield, the method comprising:forming a planar table lying in a table plane; forming a plurality of main crown facets to form a crown, said main crown facets oriented at an angle of between 26° and 35° relative to the table plane; forming a plur

1. A method of cutting a diamond to obtain a high carat yield, the method comprising:forming a planar table lying in a table plane; forming a plurality of main crown facets to form a crown, said main crown facets oriented at an angle of between 26° and 35° relative to the table plane; forming a plurality of upper pavilion facets below the main crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottom edges of the main crown facets and top edges of the upper pavilion facets; and forming a set of lower pavilion facets between bottoms of the upper pavilion facets and a culet at an angle of between 38° and 44° relative to the girdle plane, the upper pavilion facets and the lower pavilion facets forming a rib line therebetween, said rib line positioned somewhere between one-fifth and four-fifths of a distance between the girdle plane and the culet, such that the upper pavilion facets extend between 20% and 80% of the distance between the girdle plane and the culet. 2. The method of claim 1, wherein the upper pavilion facets are oriented at an angle of between 50° and 70° relative to the girdle plane.3. The method of claim 2, wherein the lower pavilion facets are oriented at an angle of between 40° and 44° relative to the girdle plane.4. The method of claim 1, wherein the upper pavilion facets are oriented at an angle of between 55° and 65° relative to the girdle plane.5. The method of claim 1, wherein the rib line is positioned midway between the girdle plane and the culet.6. The method of claim 1, wherein forming a plurality of main crown facets comprises forming eight main crown facets.7. The method of claim 1, wherein forming a plurality of upper pavilion facets below the main crown facets comprises forming eight upper pavilion facets.8. The method of claim 1, further comprising:forming a girdle about a widest circumference of the diamond, said girdle lying in the girdle plane. 9. A method of cutting a diamond comprising:forming a planar table on the diamond; forming a plurality of upper pavilion facets oriented at an angle of between 45° and 80° relative to a plane coincident with the table; forming a plurality of main crown facets between the table and upper ends of said upper pavilion facets, said crown facets being oriented at an angle of between 23° and 40° relative to the table plane; and forming a plurality of lower pavilion facets which converge to a culet at a bottom of said diamond, said lower pavilion facets bordering the upper pavilion facets at a circumferential rib line, said rib line lying at a position between 20% and 80% of a distance between the upper ends of the upper pavilion facets and the culet. 10. The method of claim 9, wherein the upper pavilion facets are oriented at an angle of between 50° and 70° relative to the table plane.11. The method of claim 10, wherein the lower pavilion facets are oriented at an angle of between 40° and 42° relative to the table plane.12. The method of claim 9, wherein the upper pavilion facets are oriented at an angle of between 55° and 70° relative to the table plane.13. The method of claim 9, wherein the rib line is positioned midway between the tops of the upper pavilion facets and the culet.14. The method of claim 9, wherein forming a plurality of main crown facets comprises forming eight main crown facets.15. The method of claim 9, wherein forming a plurality of upper pavilion facets comprises forming eight upper pavilion facets.16. The method of claim 9, further comprising:forming a girdle about a widest circumference of the diamond. 17. A method of cutting a diamond to obtain a high carat yield, the method comprising:forming a planar table lying in a table plane; forming a plurality of main crown facets to form a crown, said main crown facets oriented at an angle of between 23° and 40° relative to the table plane; forming a plurality of upper pavilion facets between bottoms of respective main crown facets and a culet at an angle of between 45° and 80° relative to a girdle plane lying between bottom edges of the main crown facets and top edges of the upper pavilion facets; and forming a set of lower pavilion facets between the bottoms of the upper pavilion facets and the culet at an angle of between 38° and 44° relative to the girdle plane, the upper pavilion facets and the lower pavilion facets forming a rib line therebetween, said rib line positioned somewhere between one-fifth and four-fifths of a distance between the girdle plane and the culet, such that the upper pavilion facets extend between 20% and 80% of the distance between the tops of the upper pavilion facets and the culet. 18. The method of claim 17, wherein the upper pavilion facets are oriented at an angle of between 50° and 70° relative to the girdle plane.19. The method of claim 18, wherein the lower pavilion facets are oriented at an angle of between 40° and 42° relative to the girdle plane.20. The method of claim 17, wherein the upper pavilion facets are oriented at an angle of between 55° and 65° relative to the girdle plane.21. The method of claim 17, wherein the rib line is positioned midway between the girdle plane and the culet.22. The method of claim 17, wherein forming a plurality of main crown facets comprises forming eight main crown facets.23. The method of claim 17, wherein forming a plurality of upper pavilion facets comprises forming eight upper pavilion facets.24. The method of claim 17, further comprising:forming a girdle about a widest diameter of the diamond. 25. A method of cutting a diamond comprising:forming a planar table on the diamond; forming a plurality of upper pavilion facets oriented at an angle of between 45° and 80° relative to a plane coincident with the table; forming a plurality of lower pavilion facets which converge to a culet at a bottom of the diamond, said lower pavilion facets bordering the upper pavilion facets at a rib line, said rib line lying at a position between 20% and 80% of a distance between upper ends of the upper pavilion facets and the culet; and forming a plurality of main crown facets between the table and upper ends of said upper pavilion facets, said main crown facets being oriented at an angle of between 23° and 40° relative to the table. 26. The method of claim 25, wherein the upper pavilion facets are oriented at an angle of between 50° and 70° relative to the table.27. The method of claim 26, wherein the lower pavilion facets are oriented at an angle of between 40° and 42° relative to the table.28. The method of claim 27, wherein the upper pavilion facets are oriented at an angle of between 55° and 70° relative to the table.29. The method of claim 28, wherein the rib line is positioned midway between the tops of the upper pavilion facets and the culet.30. The method of claim 29, wherein forming a plurality of main crown facets between the table and upper ends of said upper pavilion facets comprises forming eight main crown facets.31. The method of claim 30, wherein forming a plurality of upper pavilion facets comprises forming eight upper pavilion facets.32. The method of claim 31, further comprising:forming a girdle about a widest diameter of the diamond. 33. A method of cutting a diamond to obtain a high carat yield, the method comprising:forming a planar table lying in a table plane; forming a plurality of main crown facets to form a crown, said main crown facets oriented at an angle of between 23° and 40° relative to the planar table; forming a plurality of upper pavilion facets below bottoms of said main crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottom edges of the main crown facets and top edges of the upper pavilion facets; forming a plurality of middle pavilion facets below the upper pavilion facets oriented at an angle of between 46° and 79° relative to the table plane; and forming a set of lower pavilion facets between the middle pavilion facets and a culet at an angle of between 38° and 44° relative to the table plane, the middle pavilion facets and the lower pavilion facets forming a first rib line therebetween, said first rib line positioned somewhere between one-fifth and four-fifths of the distance between tops of the upper pavilion facets and the culet, such that the upper pavilion facets extend between 20% and 80% of the distance between the tops of the upper pavilion facets and the culet. 34. The method of claim 33, wherein the upper pavilion facets are oriented at an angle of between 50° and 70° relative to the girdle plane.35. The method of claim 34, wherein the lower pavilion facets are oriented at an angle of between 40° and 42° relative to the girdle plane.36. The method of claim 33, wherein the upper pavilion facets are oriented at an angle of between 55° and 70° relative to the girdle plane.37. The method of claim 33, wherein the rib line is positioned midway between the girdle plane and the culet.38. The method of claim 33, wherein forming a plurality of main crown facets comprises forming eight main crown facets.39. The method of claim 33, wherein forming a plurality of upper pavilion facets below bottoms of said main crown facets comprises forming eight upper pavilion facets.40. A method of cutting a diamond to obtain a high carat yield, the method comprising:forming a planar table lying in a table plane; forming a plurality of main crown facets to form a crown, said main crown facets oriented at an angle of between 26° and 35° relative to the table plane; forming a plurality of upper pavilion facets below the main crown facets at an angle of between 45° and 80° relative to a girdle plane lying between bottom edges of the main crown facets and top edges of the upper pavilion facets; and forming a set of lower pavilion facets between bottoms of the upper pavilion facets and a culet at an angle of between 38° and 44° relative to the girdle plane, the upper pavilion facets and the lower pavilion facets forming a rib line therebetween, said rib line positioned somewhere between one-fifth and four-fifths of a distance between the girdle plane and the culet, such that the upper pavilion facets extend between 20% and 80% of the distance between the girdle plane and the culet.