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Many beautiful older diamonds are cut to different proportions than modern round brilliants, which makes them a challenge to grade according to modern cut conventions. This article describes how the GIA accommodates these historic gems.
Read MoreVisit GIA at the GIT International Gem & Jewelry Conference to discover more information about GIA’s gemological education, new lab services and ongoing research activities and findings in the region.
Read More"Rare Gemstones: How to Identify"; “Suzanne Belperron”; “Gems and Minerals: Earth Treasures"
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Introduces the Chinese nephrite mine in Hechi and characterizes the “band” and dendritic patterns found in this material.
Read More“Living Jewels: Masterpieces from Nature”; “The Extraordinary World of Diamonds”; “The Workbench Guide to Jewelry”; “World Hallmarks, Volume I, 2nd ed.”; “Mineral Treasures of the World”
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Detected mineral components—jadeite and quartz, with reddish orange portions of cinnabar—shed light on a purple bead’s possible origin.
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The finale of a two-part series on the mining history of Austrian emerald deposits in the Habachtal region.
Read MoreA report summarizing the annual meeting of the Geological Society of America in Baltimore.
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Silicon, normally associated with CVD synthetic diamond, may be found in natural diamond.
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