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Há 23 horas · 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.
Há 1 dia · We offer the finest gem and jewelry education in the world with curriculum developed from our groundbreaking research and delivered by the industry’s leading experts. GIA gives you the knowledge and practical skills to translate your love for gems and jewelry into a rewarding career.
Há 23 horas · Topaz Description. This selection of gems from Ouro Prêto, Brazil, and Russia's Ural Mountains, displays the golden orange to pinkish red color range of precious topaz. The gems range from 7.61 to 14.33 carats in size. Many consumers know topaz as simply an inexpensive blue gem.
Há 2 dias · The Gemological Institute of America (GIA) has released the Spring 2024 edition of Gems & Gemology (G&G), marking the 90 th anniversary of the journal.. This issue presents research studies on coloured stones and treatments, recaps the Tucson gem shows, spotlights an impressive garnet necklace, and contains the annual G&G Challenge quiz.
Há 5 dias · Gray “Spinel Sisters”. Figure 1. David Nassi’s 69.96 ct antique cushion-cut, loupe-clean gray spinel. Prized in the trade for its metallic-like sheen, gray spinel of this size, quality, and color is extremely rare. Photo by Robert Weldon. At the AGTA show, 100% Natural Ltd.
Há 3 dias · Reading Time: 2 minutes GIA’s release of the Spring 2024 Gems & Gemology (G&G) issue marks the journal’s 90th anniversary. This issue presents research studies on colored stones and treatments, recaps the Tucson gem shows, spotlights an impressive garnet necklace and contains the annual G&G Challenge quiz. This and every issue of G&G since 1934 are available at no […]
