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2. Diamond cut - Wikipedia

   en.wikipedia.org/wiki/Diamond_cut

   The GIA began grading cut on every grading report for round brilliant beginning in 2006 [34] based on their comprehensive study of 20,000 proportions with 70,000 observations of 2,000 diamonds. [ citation needed ] The single descriptive words are as follows: Excellent, Very Good, Good, Fair, and Poor.

3. Brilliant (diamond cut) - Wikipedia

   en.wikipedia.org/wiki/Brilliant_(diamond_cut)

   Diamond proportions and facets, for the round brilliant cut. The modern round brilliant-cut was developed by Marcel Tolkowsky in 1919. The ideal proportions are 100% diameter, 53% table, 43.1% pavilion and 16.2% crown. The girdle and culet (if any—not part of Tolkowsky's original design) are cut from the ideal brilliant.

4. Gemological Institute of America - Wikipedia

   en.wikipedia.org/wiki/Gemological_Institute_of...

   While both reports contain a number of measurements, including dimensions, proportions, carat weight, color, and clarity, the Diamond Grading Report also includes a diamond plot (a graphic representation of the position and type of inclusions present in the diamond). Diamond reports from GIA (as well as other, for-profit sources) are now ...

5. Diamond (gemstone) - Wikipedia

   en.wikipedia.org/wiki/Diamond_(gemstone)

   Several different theories on the "ideal" proportions of a diamond have been and continue to be advocated by various owners of patents on machines to view how well a diamond is cut. These advocate a shift away from grading cut by the use of various angles and proportions toward measuring the performance of a cut stone.

6. Lazare Kaplan International - Wikipedia

   en.wikipedia.org/wiki/Lazare_Kaplan_International

   In 1919, Lazare Kaplan's cousin, mathematician Marcel Tolkowsky, first published the mathematical formula for diamonds cut to "ideal" proportions, a formula designed to optimise the brilliance, fire and sparkle in a polished diamond. In the same year, LKI became the first commercial-scale operation to cut its diamonds to ideal proportions.

7. American Gem Society - Wikipedia

   en.wikipedia.org/wiki/American_Gem_Society

   Created the Ideal Cut Grade for Round Brilliant shaped diamonds, often known as the AGS Ideal or the Triple Zero Cut. Offered the industry's first diamond grading reports with a Cut Grade for Princess, Emerald, Oval, and other fancy diamond shapes.