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READ MORE : Courtesy: Argyle Pink Diamonds February Birthstone The Purple Majesty of Amethyst LEARN MORE : Courtesy: Arya Esha New Gems & Gemology Issue The Geographic Origin Dilemma READ MORE featured Research & News New Service The GIA Diamond Origin Report: Traceability Based on Science Consumers now, more than ever, have a heightened awareness of sustainably and ethically sourced products. The GIA Diamond Origin Report uses scientific evaluation to provide confirmation of a diamond’s geographic origin. Learn More Feature Article The Real Gemology of Ethiopian Opals in ‘Uncut Gems’ Taking a look at the rough opal that plays a major role in the Adam Sandler film Uncut Gems.” What is the real gemology and source information of opals? Read More Industry Analysis Jewelry Sales Show Modest Rise; Higher End Soars U.S. holiday jewelry sales increased slightly from 2018. Online buying surged, while foot traffic in retail stores slowed. Read More Lab Notes Vlasovite A rare faceted vlasovite is encountered for the first time at the Carlsbad laboratory. Read More Gem News International The Rare Sun Diamond An eye-visible cloud with a star-like pattern is highlighted by the cut of the Rare Sun diamond. READ MORE Feature Article Geographic Origin Determination of Paraíba Tourmaline Copper-bearing gem tourmaline, known as Paraíba tourmaline after the location of its original discovery, is prized for its vivid blue to green color. This article explains GIA’s use of quantitative chemical analyses to distinguish samples from Brazil, Nigeria, and Mozambique. Read More Learn & Connect Learn How To Buy Engagement Rings Start A Career in Gems & Jewelry 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. Learn MoreFancy Color Diamond Dazzling brilliance. Captivating color. These are the planet’s most valued gems. Learn MoreDiamond Diamonds are among nature’s most precious and beautiful creations. Learn MoreEmerald Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine. Learn MoreCitrine Citrine is the transparent, pale yellow to brownish orange variety of quartz. Learn MoreView the Gem Encyclopedia You Might Also Like Find a Retailer learn more Shop the Campus Store Learn More Grading Promotions Learn More G&G Winter 2019 Edition Learn more Show Caption Close Caption This JavaScript enables OnlineOpinion, a method for collecting secure feedback data. By closing this banner or using this site you agree to our revised Privacy Notice , Terms of Service and Cookie Policy . This site uses cookies and similar technologies. To learn more regarding cookies and your choices, please refer to our Cookie Policy . We have also updated our updated Privacy Policy and Terms of Use . By closing this banner or browsing or using this site, you agree to our revised Privacy Policy and Terms of Service and our Cookie Policy .Gem Encyclopedia Education Research & News Analysis & Grading About GIA GIA Instruments Retailer Support GIA Store FAQs Pressroom GemKids Quality Assurance Benchmarks for Jewelry 4Cs of Diamond Quality Student Consumer Information Gem & Jewelry Careers Careers at GIA Locations Report A Concern Support GIA Contact Us Change Preferences Feedback Follow UsChange Language: English (US) English (US) English (UK) 简体中文 日本語 × Copyrights and Trademarks Privacy Notice Terms of Use Link to GIA Developer APIs Ethics and Compliance About This Site © 2002 - Gemological Institute of America Inc. GIA is a nonprofit 501(c)(3) organization. All rights...