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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. 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, the institute is headquartered in Carlsbad, California , and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 research centers.

4. List of music recording certifications - Wikipedia

   en.wikipedia.org/wiki/List_of_music_recording...

   The standard certification awards given consist of Gold, Platinum, and sometimes Diamond awards, in ascending order; the UK and Australia also have a Silver certification, ranking below Gold. In most cases, a "Multi-Platinum" or "Multi-Diamond" award is given for multiples of the Platinum or Diamond requirements.

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. Gemological Science International - Wikipedia

   en.wikipedia.org/wiki/Gemological_Science...

   GSI Gemological Laboratory performs a number of services including: loose and mounted diamonds grading; origin testing of loose and mounted diamonds and gemstones; cut grade analysis; light analysis reports; gemstone identification; sorting and screening of melee; treatment identification; laser inscription on diamonds and gemstones; metal engraving; metal inspection; and 360-degree virtual ...

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