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2. 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]

3. Mohs scale - Wikipedia

   en.wikipedia.org/wiki/Mohs_scale

   Diamond (Mohs 10) is 1500 (off scale). Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can ...

4. Gemological Institute of America - Wikipedia

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

   In 1953 the GIA developed its International Diamond Grading System and the "four Cs" (cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. [ 2 ] As of 2024, [ 3 ] the institute is headquartered in Carlsbad, California , and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 ...

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. [7] Graduates from the IGI school of Gemology are awarded an IGI Diploma.

6. ImaGem Inc. - Wikipedia

   en.wikipedia.org/wiki/ImaGem_Inc.

   Color grading of diamonds (see Diamond color) and gemstones is subjective [5] - an individual compares a subject stone under a light source to a master stone and assigns a color grade. This approach is well-known to provide a color grade that is not repeatable because, in the past, there has been confusion among different methods of grading ...

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