Article
Gems & Gemology’s 7 Most Unusual Encounters from 2019
Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 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
Emmanuel Fritsch and James E. Shigley, June 1, 1989
Some treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.
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