I''ve been studying up on cut quality on the Good Old Gold and Pricescope sites. I''ve learned that ideal proportions are often defined differently by the originators of each "standard" and by some certification agencies. There are also caveats explaining that these ideals are just predictors that a particular stone has optimal fire and brilliance, and that there may be other combinations of angles and depth for that stone that may also provide almost, or just as much, brilliance and fire as the ideal proportions. Given this variability, why doesn''t a standard exist that specifically measures and grades a diamond''s light return/refraction in terms of fire and brilliance using an instrument such as the brilliancescope? It would be much easier for diamond consumers to compare prospective diamonds based upon this particular measurement, rather than working through calculations based on ideal proportion guidelines which may or may not result in the identification of a stone with optimal fire and brilliance.
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