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2022-05-04 04:12:30

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Read More Webinar Series GIA Knowledge Sessions Engage in webinars on the most diverse and pressing issues in gemology today, including gemstone origin, laboratory-grown stones and new discoveries in field gemology. Learn More Micro-World Chondrodite in Red Spinel from Mogok, Myanmar The Bangkok lab recently encountered a single round crystal of chondrodite in red spinel, a possible indicator of Burmese origin. Read More Lab Notes Two Antique Mughal Spectacles with Gemstone Lenses Unique diamond and emerald-lensed spectacles from the Mughal Empire were tested in GIA’s New York laboratory. Read More Colored Stones Unearthed Colored Stones from the Deep The first installment of this column discusses the formation of colored stones from the crust-mantle transition and below. Read More Micro-World Radioactive Green Diamond The Carlsbad lab recently encountered a 2.42 ct green diamond showing signs of radiation treatment by the use of radioactive salts. Read More Learn & Connect Learn How To Buy Engagement Rings Discover Diamond Origin Use our labs to Verify a Stone Download Gems & Gemology This Month's Featured Gems Peridot Found in lava, meteorites, and deep in the earth’s mantle, yellow-green peridot is the extreme gem. Fancy Color Diamond Dazzling brilliance. Captivating color. These are the planet’s most valued gems. Diamond Diamonds are among nature’s most precious and beautiful creations. Emerald Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine. Citrine Citrine is the transparent, pale yellow to brownish orange variety of quartz. 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