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TEN MOST EXPENSIVE SAPPHIRES SOLD AT AUCTION
By Janet DeleuseMay 7, 2026

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"The American Gem Trade Association" About Sapphires
By Janet DeleuseSep 1, 2022

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Scientific Instruments Help Researchers Tell Gem Stories
By Janet DeleuseAug 6, 2021

Reported from the Gemological Institution of America.The names of these instruments may sound cryptic, but to GIA researchers they are the tools that help unravel...

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