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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

Color stability test: Overview of “type” classifications 23/12/2019

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

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

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