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A face-up view of a cushion cut diamond with blue color.
Gems & Gemology’s 7 Most Unusual Encounters from 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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Contribution to the Identification of Treated Coloured Diamonds: Diamonds with Peculiar Colour-Zoned Pavilions

Some treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.

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