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  2. Gemological Institute of America - Wikipedia

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

    The collection contains works published from 1496 to the present, encompassing the history and modern development of gemology. Subjects include natural and synthetic gemstones, gem treatments, jewelry design, manufacturing, and marketing. The Liddicoat Library is open to the public and the jewelry trade for on-campus research.

  3. Gemmological Institute of India - Wikipedia

    en.wikipedia.org/wiki/Gemmological_Institute_of...

    The Gem Testing Laboratory was recognized by the International apex organization of Gem and Jewellery Trade, CIBJO. With increasing consumer awareness, the jewellery industry worldwide began to issue certifications to attest the quality of gem and diamond products. The GII started diamond certification in India in 2000. . [1]

  4. American Gem Society - Wikipedia

    en.wikipedia.org/wiki/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. The Society is based in Las Vegas, Nevada , along with the affiliated American Gem Society Laboratories (AGSL) (founded in 1996) and the American Gem Society ...

  5. Diamond clarity - Wikipedia

    en.wikipedia.org/wiki/Diamond_clarity

    A clarity grade is assigned based on the overall appearance of the stone under ten times magnification, which is the standard magnification for loupes used in the gem world. Most inclusions present in gem-quality diamonds do not affect the diamonds' performance or structural integrity and are not visible to the naked eyes.

  6. 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]

  7. Gemmological Association of Great Britain - Wikipedia

    en.wikipedia.org/wiki/Gemmological_Association...

    This is a symbol of supremacy, but also represents a brilliant jewel with light radiating from it. Its tips are jewels of many different colours. Gem-A is often referred to as the central jewel, with gem education and knowledge radiating from it with the jewelled tips being the graduates and members of the association.

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  9. Gem and Jewellery Export Promotion Council - Wikipedia

    en.wikipedia.org/wiki/Gem_and_Jewellery_Export...

    Gem Testing Laboratory, Jaipur: This is a coloured gemstone centre in Jaipur. It grades and certifies all kinds of stones, its speciality is in coloured gemstones. Indian Gemological Institute, New Delhi: The Institute is located in New Delhi, IGI serves the gem testing and certification requirements of the industry in North India.

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