News & Articles
An Update on Sapphires with Unstable Color
Unexpected behavior is observed in sapphires submitted to GIA for color stability testing.
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Book Review: Pegmatites and Their Gem Minerals
Review of Pegmatites and Their Gem Minerals, by Michael Menzies and Jeffrey Scovil.
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The Type IIb De Beers Cullinan Blue Diamond
Type IIb blue diamonds are extremely rare in nature.
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