US2007067178A1PendingUtilityA1

Systems and methods for evaluating the appearance of a gemstone

49
Individually held — no corporate assignee on recordPriority: Oct 12, 2000Filed: Aug 16, 2006Published: Mar 22, 2007
Est. expiryOct 12, 2020(expired)· nominal 20-yr term from priority
Inventors:Ilene ReinitzMary JohnsonJames ShigleyThomas Scott Hemphill
G01N 21/87G06Q 30/0278
49
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Claims

Abstract

Of the “four C's,” cut has historically been the most complex to understand and assess. This application presents a three-dimensional mathematical model o study the interaction of light with a fully faceted, colorless, symmetrical round-brilliant-cut diamond. With this model, one can analyze how various appearance factors (brilliance, fire, and scintillation) depend on proportions. The model generates images and a numerical measurement of the optical efficiency of the round brilliant-called DCLR—which approximates overall fire. DCLR values change with variations in cut proportions, in particular crown angle, pavilion angle, table size, star facet length, culet size, and lower girdle facet length. The invention describes many combinations of proportions with equal or higher DCLR than “Ideal” cuts, and these DCLR ratings may be balanced with other factors such as brilliance and scintillation to provide a cut grade for an existing diamond or a cut analysis for prospective cut of diamond rough.

Claims

exact text as granted — not AI-modified
1 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that depend, at least in part, on a calculation of dispersed color light return;    inserting a digital image of a virtual diamond into the report, wherein said image is based, at least in part, on said list of proportion grades.    
     
     
         2 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that depend, at least in part, on a calculation of dispersed color light return;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         3 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on table size;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         4 . The method of  claim 3 , wherein said grade is a fire grade.  
     
     
         5 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on crown angle;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         6 . The method of  claim 5 , wherein said grade is a fire grade.  
     
     
         7 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on pavilion angle;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         8 . The method of  claim 7 , wherein said grade is a fire grade.  
     
     
         9 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on the number of girdle facets;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         10 . The method of  claim 9 , wherein said grade is a fire grade.  
     
     
         11 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on girdle thickness;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         12 . The method of  claim 11 , wherein said grade is a fire grade.  
     
     
         13 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on star facet length;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         14 . The method of  claim 13 , wherein said grade is a fire grade.  
     
     
         15 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on lower girdle length;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         16 . The method of  claim 15 , wherein said grade is a fire grade.  
     
     
         17 . A method of creating a diamond grading report comprising: 
 evaluating the cut proportion of a diamond;    listing the cut proportions of the diamond on a diamond grading report;    comparing said cut proportions to a list of proportion grades that comprise an evaluation of diamond fire and depend, at least in part, on culet size;    providing a grade of said diamond in the report, wherein said grade is based, at least in part, on said list of proportion grades.    
     
     
         18 . The method of  claim 17 , wherein said grade is a fire grade.

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