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  2. Gemological Institute of America - Wikipedia

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

    Through its library and subject experts, GIA acts as a resource of gem and jewelry information for the trade, the public and media outlets. [2] 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]

  3. American Gem Society - Wikipedia

    en.wikipedia.org/wiki/American_Gem_Society

    For the next few years he worked to promote the need for gemological education and train a new breed of "certified" jewelers. These jewelers would form the foundation of the Gemological Institute of America (GIA), [1] and later the AGS. In its history, the AGS has achieved significant accomplishments within the field of gemology and jewelry.

  4. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Gemstones have no universally accepted grading system. Diamonds are graded using a system developed by the Gemological Institute of America (GIA) in the early 1950s. Historically, all gemstones were graded using the naked eye. The GIA system included a major innovation: the introduction of 10x magnification as the standard for grading clarity.

  5. Signet Jewelers - Wikipedia

    en.wikipedia.org/wiki/Signet_Jewelers

    Signet Jewelers Ltd. (Ratner Group 1949–1993 then Signet Group plc to September 2008) is, as of 2015, the world's largest retailer of diamond jewellery. [1] The company is domiciled in Bermuda and headquartered in Akron, Ohio, and is listed on the New York Stock Exchange. The group operates in the middle market jewellery segment and has ...

  6. International Gemological Institute - Wikipedia

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

    International Gemological Institute (IGI) is a Belgian diamond, colored stone and jewelry certification organization. Established in 1975, it is the largest independent gemological laboratory worldwide.

  7. Blue Nile Inc. - Wikipedia

    en.wikipedia.org/wiki/Blue_Nile_Inc.

    The company that became Blue Nile began in 1995 when Doug Williams of Williams & Son Inc. of Seattle started a website to sell diamonds online. [3] Mark C. Vadon, then a management consultant at Bain & Company, purchased a diamond engagement ring from the site in 1998. [3]

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