Data processing: financial – business practice – management – or co – Automated electrical financial or business practice or...
Reexamination Certificate
2007-08-21
2007-08-21
Trammell, James P. (Department: 3621)
Data processing: financial, business practice, management, or co
Automated electrical financial or business practice or...
C702S035000, C356S030000, C356S425000, C356S031000, C356S303000, 36, 36
Reexamination Certificate
active
09687759
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 to 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.
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Hemphill Thomas S.
Johnson Mary L.
Reinitz Ilene M.
Shigley James E.
Gemological Institute of America, Inc.
Greene Daniel L.
Trammell James P.
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