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

    Hace 5 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.

  2. 4cs.gia.edu › interactive-4cs › colorDiamond Color | Gemological Institute of America - 4Cs

    Hace 1 día · 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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    • GIA-Gemological Institute of America
    • Gemological Institute of America (GIA) - Silver Winner - 2015 New York ...
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    • Gemological Institute of America – GIA Logo Download png

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  4. www.igi.orgInternational Gemological Institute | Jewelry & Gemstone Grading

    20 de may. de 2024 · IGI is the world's largest independent lab for testing & grading diamonds, gemstones, & jewelry, with 29 labs & 18 schools in 10 countries.

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

    Hace 2 días · Amethyst is the purple variety of the quartz mineral species and the gem most commonly associated with the color purple.

  6. 4cs.gia.edu › interactive-4cs › cutAbout Diamond Cut | Gemological Institute of America - 4Cs

    Hace 1 día · 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.

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

    Hace 3 días · Diamond Clarity. Natural diamonds are the result of carbon exposed to tremendous heat and pressure deep in the earth. This process can result in a variety of internal characteristics called 'inclusions' and external characteristics called 'blemishes.'

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