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  2. International Gemological Institute - Wikipedia

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

    IGI is the largest laboratory for certification of diamonds and fine jewelry. [8] IGI is International Organization for Standardization (ISO) 9001: 2000 certified in four countries, including the United States, Canada, India and the United Arab Emirates. [citation needed]

  3. Gemological Institute of America - Wikipedia

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

    Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.

  4. 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 ...

  5. 10 Biggest Diamond Companies in the World - AOL

    www.aol.com/news/10-biggest-diamond-companies...

    Public Joint Stock Company ALROSA (MCX:ALRS.ME), Rio Tinto Group (ASX:RIO.AX), and Anglo American plc (LSE:AAL.L) are met by Gem Diamonds Limited (LSE:GEMD.L) in our list of the world's biggest ...

  6. American Gem Society - Wikipedia

    en.wikipedia.org/wiki/American_Gem_Society

    Logo of the American Gem Society. The American Gem Society (AGS) is a trade association of retail jewelers, independent appraisers, suppliers, and selective industry members, which was founded in 1934 by Robert M. Shipley.

  7. The 12 best places to buy jewelry online in 2025 - AOL

    www.aol.com/lifestyle/best-places-to-buy-jewelry...

    Best for gemstone jewelry: Shane Co. Best for wedding jewelry: Blue Nile. Best for fine jewelry: James Allen. Best for USA-made jewelry: Allurez. Best for sustainable jewelry: GLDN. Best for ...