The relative chemical diversity of emeralds from different deposits worldwide allows clear origin determination in most cases. This contribution explains the criteria used by GIA to make geographic origin conclusions for emeralds.
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Explores the history, geology, and current production of this unique source of large diamonds.
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Shows how genetic material extracted from small amounts of pearl powder can be a useful indicator of this akoya cultured pearl species.
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Examines the sources, color, texture, and chemical composition of jadeite from Japanese deposits.
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The geographic source of this rare color-change gem has a significant impact on value. Trace element chemistry profiles allow GIA to accurately determine origin for alexandrite from several countries.
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In some cases, the value of a sapphire depends strongly on its geographic origin. This article details the origin data GIA has collected for blue sapphire and describes its methodology for using the data in geographic origin determination.
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An overview of the geographic origin complexities facing the gem and jewelry industry today.
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A look at the gem ornamentation of this landmark, as well as the jewels of the Mughal dynasty.
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Chronicles the history of this cultural landmark, originally assembled for the Prussian king between 1701 and 1714, and its reconstruction by the Soviet Union starting in 1979.
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A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.
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