Updated terminology for HPHT-treated sapphires

Meggen, 7 September 2018 GRS has decided to update the treatment disclosure terminology used for sapphires enhanced by heat at elevated pressure (published in the literature as HPHT, Song, J. et al. 2015) Generally the pressure applied to diamonds during the diamond HPHT treatment process is much higher than that of the sapphire treatment. GRS […]

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GRS Color Terms Go Global

The proliferation of international acceptance and use of GRS color terms have revolutionalised the gemological market. Embraced by the consumer, distinguished auction houses, retailers, wholesale and laboratories, our color terms transcend across many levels of the trade. This booklet previews the most popular GRS color descriptions that have been used by GRS and the global […]