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  2. 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 ...

  3. Diamond clarity - Wikipedia

    en.wikipedia.org/wiki/Diamond_clarity

    Diamond certified FL (flawless) by the GIA Two diamonds of grade VS 1 and SI 2 respectively. The GIA diamond grading scale is divided into six categories and eleven grades. [2] The clarity categories and grades are: [3] Flawless category (FL) diamonds have no inclusions or blemishes visible under 10× magnification. [3]

  4. Richard T. Liddicoat - Wikipedia

    en.wikipedia.org/wiki/Richard_T._Liddicoat

    In 1953, Liddicoat introduced the GIA diamond grading system - a practical approach to grading the quality of colorless to light yellow polished diamonds on the basis of color, clarity, and cut. A central feature was the D-to-Z color grading system for faceted colorless to light yellow diamonds—the vast majority of diamonds seen in the trade.

  5. International Gemological Institute - Wikipedia

    en.wikipedia.org/wiki/International_Gemological...

    IGI provides independent grading reports, colored stone reports, identification and appraisal reports, diamond authentication and attestations of origin, and laser inscription services. They also offers diamond and colored stone courses through IGI's Schools of Gemology. The IGI school was the first to offer the practical Rough Diamond course. [4]

  6. Brilliant (diamond cut) - Wikipedia

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

    The GIA began grading cut on every grading report beginning in 2006, based on their comprehensive study of 20,000 proportions with 70,000 observations of 2,000 diamonds. [4] The single descriptive words are as follows: Excellent, Very Good, Good, Fair, and Poor. The distance from the viewer's eye to the diamond is important.

  7. Diamond cut - Wikipedia

    en.wikipedia.org/wiki/Diamond_cut

    The GIA began grading cut on every grading report for round brilliant beginning in 2006 [26] 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. [25]

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