We provide an origin determination on the following gem varieties/materials:
Sapphire (all colors), Ruby, Emerald
Paraiba/Paraiba-type tourmaline
Alexandrite, Demantoid Garnet
Pink to Red Spinel, Cobalt Spinel
Occasional: We provide an origin determination on the following gem varieties/materials:
Opal
Cats-Eye Chrysoberyl
Spinel (colors other than pink to red and cobalt)
Hiddenite Spodumene
There are certain gem species and varieties that are produced in single locations or from a commercially significant/gem-quality standpoint, from only very..
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