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#GRS documentary 2015: A journey to Mogok

#GRS documentary 2015: Interesting discoveries at the Mandalay gemstone market

Latest GRS Alerts

New types of synthetic periclase identified by C2S inclusions – dicalcium silicate cement hardener 19/12/2018

Warning: Synthetic Padparadscha sold as Natural in the trade. 11/09/2018

GRS Alert: Unusual phosphorescent pebbles identified as synthetic aggregates 24/04/2016

Recent Posts

Introducing GRS brilliancy-type “vibrant” 14/11/2019

Reply to CIBJO Gemmological Commissions’ special report on sapphires heat treated under pressure 28/10/2019

Retake of GRS presentation on HPHT-treated sapphires from 2019 GILC meeting in Tucson, AZ 05/02/2019

GRS Newsletter

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