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There are several ways to estimate a GIA Cut Grade for a standard round brilliant cut diamond. The GIA Cut Grading System for standard round brilliant cut diamonds (D to Z colors only, 0.15 carat and larger) was launched on GIA Laboratory grading reports in January 2006.
GIA Cut Grade Estimation Tables for Standard Round Brilliant Cut Diamond Explains how to locate a particular proportion combination, and determine whether it is close to a boundary in the cut grading system.
Example: Consider a round brilliant diamond with these proportions: table 56%, crown angle 36.5°, pavilion angle 41.2°, star length 55%, lower half 80%, medium girdle, no culet, Very Good polish and symmetry, and girdle thickness 3.0%.
Beyond4Cs.com’s Ideal Cut Proportions for Round Diamonds. Now, with all the technical specifications laid out, you might assume that all the diamonds in the market should be polished to ideal proportions if cutters simply followed a standard formula. However, the truth is far from that.
18 Δεκ 2023 · Ideal Cut Diamond Proportions The best diamond proportions allow light to refract and reflect back to your eyes. The ideal round diamond proportions are listed in the table below and based on expert recommendations.
worked to establish the ideal angles and proportions to cut the facets of the Standard Round Brilliant (SRB) diamond in order to produce the ‘Ideal’ gem. This paper reviews
Within two years of Wade’s book, Herbert Whitlock echoed Wade: “Calculations ... have led to the assumption of the ideal proportions of the brilliant cutting for diamond to be close to the following: Top angle, 35°; back angle, 41°”2.
