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The New GIA Diamond Cut Grade Is Here.
GIA (Gemologocal Institute of America) the foremost diamond grading laboratory in the world has introduced as of January 3, 2006 their new Cut grade for round brilliant shape diamonds.
The New GIA Diamond Grading Report.
Based on fifteen years of meticulous research and over 70,000 human observations of diamonds of varying Cut qualities, GIA has been able to assess the 58 facets that comprise the most popular and most sold round brilliant shape diamond and define it's Cut quality along the lines of "Excellent", "Very Good", "Good", "Fair", and "Poor."
The graph below depicts the round diamond facets that GIA analyzed to arrive at their Cut Grade System.
Critical facets that comprise the round brilliant shape diamond. Maximizing a diamond's brilliance, dispersion, and scintillation depends on the correct facet size, facet angle, and facet alignment of all the 58 facets working in unison. GIA's Cut Grade distills all of this into an easy to understand Cut Grade.
Below are the measurements of various facets that go into determining the Cut Grade.
