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

    Há 2 dias · 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.

    • Clarity

      Evaluating diamond clarity involves determining the number,...

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

    Há 5 dias · Amethyst Description. This amethyst crystal is from Namibia. It shows classic quartz crystal shape: a six-sided columnar crystal with a pyramid-shaped termination at the top. Courtesy Daniel Trinchillo, Fine Minerals International. Amethyst is the purple variety of the quartz mineral species.

  3. Imagens

    • The Gemological Institute of America - Prosumer Diamonds
    • Everything you Need to Know about GIA (Gemological Institute of America ...
    • GIA_Logo | Grants Jewelry

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

    Há 4 dias · GIA's D-to-Z color-grading scale is the industry's most widely accepted grading system. The scale begins with the letter D, representing colorless, and continues, with increasing presence of color, to the letter Z.

  5. www.gia.edu › gia-news-press › gia-at-las-vegas-showsGIA Brings Exciting Lineup to Las Vegas Shows!

    Há 6 dias · An independent nonprofit organization, GIA (Gemological Institute of America), established in 1931, is recognized as the world’s foremost authority in gemology. GIA invented the famous 4Cs of Color, Clarity, Cut and Carat Weight and, in 1953, created the International Diamond Grading System™ which is recognized around the world as the standard for diamond quality.

  6. Vídeos

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