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It is possible that this material actually has more erbium yttrium than yttrium
specifically Bi12GeO20 aka sillenite)
though it's also possibly an intentional dopant (color in moissanite is complicated in a similar way to diamond)
We have complete pixel prisms
Mutant YbAG Lab Garnets Stone:Square Cut Opalescent Brown 16.7ct 11.5mm It is possible that thisThese are gems cut from a defective crystal of ytterbium aluminum garnet (or at least it was supposed to be), or YbAG, which was custom grown for us and went wrong. This is a brand new garnet which was grown for us! YbAG has been used in the laser industry but has never been publicly available to the gem world as far as we know. It should have been a deep blue but turned out a weird mix of blue, green, gold, brown and opalescent. How odd! These stones