Cutting method for a diamond with low depth percentage and resultant cut diamond

Abstract

A gemstone, and a method for cutting a gemstone, such that the resulting gemstone has a total depth percentage of between 38-55% but still provides for a brilliant cut without having face main facets intersect a cullet.

1 . A cut gemstone including:
 a crown and a pavilion separated by a girdle, each of said crown and said pavilion being cut to have multiple facets, said pavilion facets including:
 a cullet facet; 
 belly main facet contacting said girdle facet and said cullet facet; 
 a face main facet contacting said girdle facet but not said cullet facet; 
 a shoulder main facet between said belly main facet and said face main facet; 
 at least two pavilion half facets between said belly main facet and said shoulder main facet; and 
 at least two pavilion half facets between said shoulder main facet and lace main facet; 
   wherein said belly main facet has a facet angle between 28 and 38 degrees;   wherein said face main facet has a facet angle between 28 and 38 degrees; and   wherein a total depth of said gemstone is between 35 percent and 55 percent of a dimeter of said girdle.   
     
     
         2 . The cut gemstone of  claim 1  wherein said cut gemstone is a cut diamond. 
     
     
         3 . The cut gemstone of  claim 1  wherein said gemstone girdle is generally an oval. 
     
     
         4 . The cut gemstone of  claim 1  wherein said gemstone girdle is generally a marquise. 
     
     
         5 . The cut gemstone of  claim 1  wherein said gemstone girdle is generally a pear. 
     
     
         6 . The cut gemstone of  claim 1  wherein said gemstone girdle is generally a cushion. 
     
     
         7 . The cut gemstone of  claim 1  wherein:
 said crown has a crown angle; 
 said pavilion has a pavilion angle; and 
 said crown angle is greater than said pavilion angle by between 6 degrees and 12 degrees inclusive. 
 
     
     
         8 . The cut gemstone of  claim 1  wherein a twist angle of said pavilion is between 30 and 40 degrees. 
     
     
         9 . The cut gemstone of  claim 1  wherein said shoulder main facet has a facet angle of between 25 and 33 degrees. 
     
     
         10 . The cut gemstone of  claim 1  wherein said facet angle of said shoulder main facet is less than said facet angle of said ace main facet. 
     
     
         11 . The cut gemstone of  claim 1  wherein said cullet is in the shape of an elongated hexagon. 
     
     
         12 . The cut gemstone of  claim 1 :
 wherein, said shoulder main facet and said belly main facet meet at a first portion of a line of intersection;   wherein, said at least two pavilion half facets between said shoulder main facet and said belly main facet meet at a second portion of said line of intersection; and   wherein, said first portion of said line of intersection is equal to or longer than said second portion of said line of intersection.   
     
     
         13 . The cut gemstone of  claim 1  wherein said crown includes a kite facet, at least two crown half facets, a table, and a star facet. 
     
     
         14 . The cut gemstone of  claim 13  wherein an average table diameter is between 54 and 64 percent of an average diameter of said girdle. 
     
     
         15 . The cut gemstone of  claim 13  wherein said cut gemstone includes 58 total facets. 
     
     
         16 . The cut gemstone of  claim 1  wherein said shoulder main facet contacts said girdle facet and said cullet facet. 
     
     
         17 . The cut gemstone of  claim 1  wherein said cullet has an average diameter of less than 5 percent the average diameter of the girdle. 
     
     
         18 . A cut gemstone including:
 a crown and a pavilion separated by a girdle, each of said crown and said pavilion being cut to have multiple facets, said pavilion facets including:
 a cullet facet; 
 a belly main facet contacting said girdle facet but not said cullet facet; 
 a face main facet contacting said girdle facet but not said cullet facet; 
 a shoulder main facet between said belly main facet and said face main tweet; 
 at least two pavilion half facets between said belly main facet and said shoulder main facet; and 
 at least two pavilion half facets between said shoulder main facet and face main facet; 
   wherein said belly main facet has a facet angle between 28 and 36 degrees;   wherein said face main facet has a facet angle between 30 and 36 degrees; and   wherein a total depth of said gemstone is between 35 percent and 55 percent of a diameter of said girdle.   
     
     
         19 . The cut gemstone of  claim 18 :
 wherein, said shoulder main facet and said belly main facet meet at a first portion of a line of intersection;   wherein, said at least two pavilion half facets between said shoulder main facet and said belly main facet meet at a second portion of said line of intersection; and   wherein, said first portion of said line of intersection is equal to or longer than said second portion of said line of intersection.   
     
     
         20 . The cut gemstone of  claim 18  wherein a twist angle of said pavilion is between 30 and 40 degrees.