JDMISGem Reference
Man-made product (synthetic garnet-structure crystal) · GGG (Gadolinium Gallium Garnet)

GGG

GGG — GGG (Gadolinium Gallium Garnet)

The heavy 1970s simulant: SR, RI 1.97, diamond-equal fire, SG 7.05 and sunlight-browning. Heft plus SW fluorescence identifies vintage stones on the spot.

Colour
colourless to white
Transparency
Transparent
RI
1.970
SG
6.95–7.09
Mohs
6.5
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