Gemstone and method for cutting the same

Abstract

The invention relates to a gemstone ( 10 ) comprises a girdle ( 13 ), a crown ( 11 ) and a pavilion ( 12 ). The crown has a table ( 14 ), ten star facets ( 15 ) surrounding the table, ten bezel facets ( 16 ) aligned between the star facets and twenty upper girdle facets ( 20 ) aligned between the bezel facets. The pavilion is provided with ten pavilion main facets ( 24 ), twenty pavilion hook facets ( 29 ) aligned between the pavilion main facets and ten pavilion star facets ( 34 ) aligned between the pavilion hook facets. The invention also relates to a method of cutting the gemstone.

What is claimed is: 
     
         1 . A method of cutting a diamond having a crown, a girdle and a pavilion, the method comprising:
 forming ten pavilion main facets extending concentrically from a point of the pavilion distant from the girdle and forming at an angle between 40.75° and 41.50° relative to a plane parallel to a horizontal plane of the girdle;   forming twenty substantially triangular pavilion hook facets aligned between the pavilion main facets and forming at an angle between 41.50° and 42.25° relative to a plane parallel to a horizontal plane of the girdle, wherein each of the pavilion hook facets is aligned adjacent to, and forms a common edge with another pavilion hook facet to form a pair of pavilion hook facets, and each of the pair of pavilion hook facets is aligned between two adjacent pavilion main facets; and   forming ten substantially triangular pavilion star facets between the pavilion hook facets and forming at an angle between 45.75° and 46.50° relative to a plane parallel to a horizontal plane of the girdle, wherein the pavilion star facets are aligned around periphery of the pavilion and each pavilion star facet includes a first side forming a first common edge with a side of a first pavilion hook facet of the pair of pavilion hook facets and a second side forming a second common edge with a side of a second pavilion hook facet of the pair of pavilion hook facets.   
     
     
         2 . The method according to  claim 1 , wherein the pavilion main facets are formed at an angle of 41°, relative to the plane parallel to the horizontal plane of the girdle. 
     
     
         3 . The method according to  claim 1 , wherein the pavilion hook facets are formed at an angle of 41.75°, relative to the plane parallel to the horizontal plane of the girdle. 
     
     
         4 . The method according to  claim 1 , wherein the pavilion star facets are formed at an angle of 46°, relative to the plane parallel to the horizontal plane of the girdle. 
     
     
         5 . The method according to  claim 1 , wherein the pavilion main facets are formed at an angle of 41°, the pavilion hook facets are formed at an angle of 41.75° and the pavilion star facets are formed at an angle of 46°, relative to the plane parallel to the horizontal plane of the girdle. 
     
     
         6 . The method according to  claim 1 , further comprising:
 forming a table at the crown;   forming ten star facets surrounding the table;   forming ten bezel facets between the star facets; and   forming twenty upper girdle facets around periphery of the crown and   aligning them between the bezel facets.   
     
     
         7 . The method according to  claim 6 , further comprising:
 aligning each of the bezel facets between two adjacent star facets;   aligning each of the upper girdle facets adjacent to, and forming a common edge with another upper girdle facet to form a pair of upper girdle facets; and   aligning each of the pair of upper girdle facets between two adjacent bezel facets.