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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 › topaz-descriptionTopaz Description - GIA

    Hace 2 días · Topaz is allochromatic, which means that its color is caused by impurity elements or defects in its crystal structure rather than by an element of its basic chemical composition. The element chromium causes natural pink, red, and violet-to-purple colors in topaz. Imperfections at the atomic level in topaz crystal structure can cause yellow ...

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  5. 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.

  6. rapaport.com › news › gia-discovers-ancient-text-inGIA Discovers ‘Ancient Text’ in CVD Diamond

    Hace 5 días · GIA Discovers ‘Ancient Text’ in CVD Diamond. In a lab-grown diamond submitted for testing, Gemological Institute of America (GIA) scientists found a “never-before-seen” cloud feature resembling lines of text from an ancient manuscript. “The dichotomy of a thoroughly modern diamond with a cloud feature that evoked an ancient text ...

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  8. 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.

  9. www.britannica.com › topic › diamond-gemstoneDiamond | Definition, Properties, Color, Applications, & Facts

    Hace 4 días · May 21, 2024, 11:36 PM ET (Live Science) Scientists grow diamonds from scratch in 15 minutes thanks to groundbreaking new process. diamond, a mineral composed of pure carbon. It is the hardest naturally occurring substance known; it is also the most popular gemstone.