Novel arched gemstone and method of manufacture

Abstract

A diamond, which has a step-cut arched configuration on one end and a baguette-style configuration on the other, comprising a girdle, a top or crown above the girdle, and a pavilion or base below the girdle. The crown terminates in an upper planar surface known as a “table,” which is generally parallel to the girdle plane. The arched end is comprised of step-cut crown facets that are preferably arranged about a common center, and upstanding pavilion facets that are also preferably arcuately arranged about the common center. The pavilion also includes a large, arched window facet.

What is claimed is: 
     
         1 . An arched diamond, comprising:
 a generally planar table lying in a table plane;   a circumferential girdle lying in a girdle plane, the table plane being substantially parallel to the girdle plane;   a first end of the diamond being substantially square and including a first-end crown section defined by first, second and third parallel step-cut crown facets lying between the table and girdle;   a second, arched, end of the diamond being arched shaped and including a crown section defined by a series of angularly arranged step-cut facets arranged radially about a common center;   the first end of the diamond including a first-end pavilion section, lying between the girdle and a culet, defined by first, second, third and fourth rows of step cut first-end pavilion facets forming, together with the first end crown section, a baguette style end;   the second end of the diamond including a second-end pavilion section, lying between the girdle and the culet, comprised of:
 first, second, third and fourth step cut second-end pavilion facets, and 
 one or more upstanding pavilion facets arranged in an arcuate manner about said common center; 
   the first second-end pavilion facet being characterized as forming an enlarged window defined at least in part by an arcuate upper rib line, said upper rib line being bounded above by said one or more upstanding pavilion facets and below by the first second-end pavilion facet.   
     
     
         2 . The diamond of  claim 1 , wherein the upstanding pavilion facets are oriented at substantially 90° relative to the girdle plane and arranged in an arch having a substantially common center. 
     
     
         3 . The diamond of  claim 1 , wherein the first second-end pavilion facet is oriented at a break angle of approximately in the range of 50°-55° relative to the girdle plane. 
     
     
         4 . The diamond of  claim 1 , wherein the first row of crown facets on the first end of the diamond are oriented at an angle of 40°-43° relative to the girdle plane. 
     
     
         5 . The diamond of  claim 1 , wherein the second row of crown facets on the first end of the diamond are oriented at an angle of 30°-32° relative to the girdle plane. 
     
     
         6 . The diamond of  claim 1 , wherein the third row of crown facets on the first end of the diamond are oriented at an angle of 20°-22° relative to the girdle plane. 
     
     
         7 . The diamond of  claim 1 , wherein the second second-end pavilion facet is oriented at an angle of approximately in the range of 42°-45° relative to the girdle plane. 
     
     
         8 . The diamond of  claim 1 , wherein the third second-end pavilion facet is oriented at an angle of approximately in the range of 36°-39° relative to the girdle plane. 
     
     
         9 . The diamond of  claim 1 , wherein the fourth second-end pavilion facet is oriented at an angle of approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         10 . The diamond of  claim 1 , wherein the first row of pavilion facets on the first end of the diamond is oriented at a break angle of approximately in the range of 50°-55° relative to the girdle plane. 
     
     
         11 . The diamond of  claim 1 , wherein the second row of pavilion facets on the first end of the diamond is oriented at an angle of approximately in the range of 42°-45° relative to the girdle plane. 
     
     
         12 . The diamond of  claim 1 , wherein the third row of pavilion facets on the first end of the diamond is oriented at an angle of approximately in the range of 36°-39° relative to the girdle plane. 
     
     
         13 . The diamond of  claim 1 , wherein the fourth row of pavilion facets on the first end of the diamond is oriented at an angle of approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         14 . The diamond of  claim 1 , wherein the first row of crown facets on the second end of the diamond are oriented at an angle of 40°-43° relative to the girdle plane. 
     
     
         15 . The diamond of  claim 1 , wherein the second row of crown facets on the second end of the diamond are oriented at an angle of 30°-32° relative to the girdle plane. 
     
     
         16 . The diamond of  claim 1 , wherein the third row of crown facets on the second end of the diamond are oriented at an angle of 20°-22° relative to the girdle plane. 
     
     
         17 . An arched diamond, comprising:
 a table lying in a table plane;   a girdle lying in a girdle plane, the girdle plane being substantially parallel to the table plane;   the diamond being comprised of a first end and a second end;   the first end being comprised of a first-end crown section and a first-end pavilion section;   the second end being comprised of a second-end crown section and a second-end pavilion section;   the first-end crown section being comprised of:
 a portion of the table, and first, second and third rows of first end step-cut crown facets, the first row being oriented at a first break angle relative to the girdle plane and being arranged along a rectangular periphery of the first end of the diamond, the second row being oriented at a second break angle relative to the girdle plane, and the third row being oriented at a third break angle relative to the girdle plane; 
   the first end pavilion section being comprised of:
 first, second, third and fourth rows of first end step-cut crown facets, the first row being oriented at a first break angle relative to the girdle plane and being arranged along a rectangular periphery of the first end of the diamond, the second row being oriented at a second break angle relative to the girdle plane, the third row being oriented at a second break angle relative to the girdle plane, and the fourth row being oriented at a fourth break angle relative to the girdle plane; 
   the second-end crown section being comprised of:
 a continuation of the table, and a series of angularly arranged step-cut facets arranged radially about a common center; 
   the second-end pavilion section being comprised of:
 first, second, third and fourth step cut second-end pavilion facets, and 
 one or more upstanding pavilion facets being arranged in an arcuate relationship about said common center; 
 the first second-end pavilion facet being characterized as forming an enlarged window defined at least in part by an arcuate upper rib line, said upper rib line being bounded above by said one or more upstanding pavilion facets and below by the first second-end pavilion facet. 
   
     
     
         18 . The diamond of  claim 17 , wherein the upstanding pavilion facets are oriented at substantially 90° relative to the girdle plane and arranged in an arch having a substantially common center. 
     
     
         19 . The diamond of  claim 17 , wherein the first second-end pavilion facet is oriented at a break angle approximately in the range of 50°-55° relative to the girdle plane. 
     
     
         20 . The diamond of  claim 17 , wherein the first row of crown facets on the first end of the diamond are oriented at an angle approximately in the range of 40°-43° relative to the girdle plane. 
     
     
         21 . The diamond of  claim 17 , wherein the second row of crown facets on the first end of the diamond are oriented at an angle approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         22 . The diamond of  claim 17 , wherein the third row of crown facets on the first end of the diamond are oriented at an angle approximately in the range of 20°-22° relative to the girdle plane. 
     
     
         23 . The diamond of  claim 17 , wherein the second second-end pavilion facet is oriented at an angle approximately in the range of 42°-45° relative to the girdle plane. 
     
     
         24 . The diamond of  claim 17 , wherein the third second-end pavilion facet is oriented at an angle approximately in the range of 36°-39° relative to the girdle plane. 
     
     
         25 . The diamond of  claim 17 , wherein the fourth second-end pavilion facet is oriented at an angle approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         26 . The diamond of  claim 17 , wherein the first row of pavilion facets on the first end of the diamond is oriented at a break angle approximately in the range of 50°-55° relative to the girdle plane. 
     
     
         27 . The diamond of  claim 17 , wherein the second row of pavilion facets on the first end of the diamond is oriented at an angle approximately in the range of 42°-45° relative to the girdle plane. 
     
     
         28 . The diamond of  claim 17 , wherein the third row of pavilion facets on the first end of the diamond is oriented at an angle approximately in the range of 36°-39° relative to the girdle plane. 
     
     
         29 . The diamond of  claim 17 , wherein the fourth row of pavilion facets on the first end of the diamond is oriented at an angle approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         30 . The diamond of  claim 17 , wherein the first row of crown facets on the second end of the diamond are oriented at an angle approximately in the range of 40°-43° relative to the girdle plane. 
     
     
         31 . The diamond of  claim 17 , wherein the second row of crown facets on the second end of the diamond are oriented at an angle approximately in the range of 30°-32° relative to the girdle plane. 
     
     
         32 . The diamond of  claim 17 , wherein the third row of crown facets on the second end of the diamond are oriented at an angle approximately in the range of 20°-22° relative to the girdle plane.