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  1. GIA is an independent nonprofit that provides research, education and laboratory services for gem and jewelry professionals and enthusiasts. Learn about gemology, gem identification, diamond origin, colored stones, and more from GIA's experts and publications.

    • Gem Encyclopedia

      GIA’s Guide to Gemstones: Gem Encyclopedia GIA’s Gem...

    • Citrine

      Citrine is rare in nature. In the days before modern...

    • Birthstones

      Birthstones are a fun, popular and colorful introduction to...

    • Emerald

      Gem experts differ on the degree of green that makes one...

  2. Há 4 dias · GIA is the world’s foremost authority on diamonds, colored stones, and pearls. Learn about its history, research, education, and quality standards in gems and jewelry.

  3. 10 de ago. de 2020 · Learn about GIA's diverse course offerings in gemology, jewelry design and technology, and pearls. Choose from online, on-campus, or hybrid programs and certificates at various locations worldwide.

  4. Founded in 1931, GIA's mission is to protect buyers and sellers of gemstones by setting and maintaining the standards used to evaluate gemstone quality. The institute does so through research, gem identification, diamond grading services, and a variety of educational programs.

  5. GIA Diamond Origin Report. The new GIA Diamond Origin Report contains all the unbiased, accurate data of a Diamond Grading Report, plus GIAs scientific determination of the diamond’s country of origin and a microscopic laser inscription of the report number on the diamond’s girdle.

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  6. From the Hope diamond to the Spirit of the Rose, the Taylor Burton and the Lesotho Promise, we are trusted by museums and top auction houses all over the world to grade and research nature’s finest treasures. We apply the same passion, precision and expertise that we use in grading these world-famous diamonds to grading every diamond ...

  7. Established in 1931, GIA is the world’s largest and most respected nonprofit institute of gemological research and learning. GIA discovers (through GIA Research), imparts (through GIA Education), and applies (through the GIA laboratory and GIA Instruments) gemological knowledge to the public.