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  1. www.gia.edu › gia-aboutThe GIA Difference - GIA.edu

    Hace 2 días · Established in 1931, the Gemological Institute of America (GIA) is the world’s foremost authority on diamonds, colored stones, and pearls. A public benefit, nonprofit institute, GIA is the leading source of knowledge, standards, and education in gems and jewelry.

    • My GIA

      My Laboratory & GIA Laboratory Client Portal. Now featuring...

    • Graduate Gemologist

      Graduate Gemologist ® Program. The GIA Graduate Gemologist...

    • Submit a Gem

      The GIA Memo Creator makes it easier than ever to submit...

    • List Your Store

      Search a city or postal code to find retailers who carry...

  2. www.gia.edu › amethyst-descriptionAmethyst Description - GIA

    Hace 5 días · Amethyst is the purple variety of the quartz mineral species. It’s the gem that’s most commonly associated with the color purple, even though there are other purple gems such as sapphire and tanzanite. Its purple color can be cool and bluish, or a reddish purple that’s sometimes referred to as “raspberry.”. Most people think of ...

  3. www.gia.edu › emerald-descriptionEmerald Description - GIA

    Hace 4 días · Emerald is the green to bluish green variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colors. Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl. Some people in the trade tend to give the name emerald to any green beryl colored by ...

  4. 4cs.gia.edu › interactive-4cs › colorDiamond Color | Gemological Institute of America - 4Cs

    Hace 4 días · About. Diamond Color. The color evaluation of most gem-quality diamonds is based on the absence of color. A chemically pure and structurally perfect diamond has no hue, like a drop of pure water, and consequently, a higher value.

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  6. rockseeker.com › diamonds-a-look-at-the-worldsDiamonds: A Look at the World's Most Coveted and Hardest ...

    Hace 21 horas · Diamonds, known for their unrivaled hardness and dazzling brilliance, are the most coveted gemstones in the world. Composed entirely of carbon atoms arranged in a crystal lattice, diamonds exhibit exceptional durability and optical properties. Emerald Cut diamond with a finished weight of 142.90 carats. These precious stones range from ...

  7. 4cs.gia.edu › interactive-4cs › cutAbout Diamond Cut | Gemological Institute of America - 4Cs

    Hace 2 días · Brightness. Internal and external white light reflected from a diamond. Fire. The scattering of white light into all the colors of the rainbow. Scintillation. The sparkle a diamond produces, and the pattern of light and dark areas caused by reflections within the diamond.

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    • Everything you Need to Know about GIA (Gemological Institute of America ...
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    • Gemological Institute of America (GIA) - Silver Winner - 2015 New York ...

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  9. www.stuller.com › brand › giaGIA® | Gemological Institute of America | Precious Gems

    Hace 5 días · GIA ® is the leading source in knowledge and education for diamonds and gemstones. The nonprofit organization has made countless innovations in the field of gemology and continues to educate and enable jewelers of the future. Browse Stuller's inventory of GIA products.