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What does FGYG stand for?

FGYG stands for Fancy Grayish Yellowish Green

This definition appears rarely

Samples in periodicals archive:

Rare Green Diamond (faceted): NATURAL, Fancy Grayish-Yellowish-Green.
Image courtesy of Leibish & Co. GIA color grades for the (above) diamonds From left to right: Fancy Deep Brownish Yellow, Fancy Vivid Yellow Orange, Fancy Vivid Yellow Orange, Fancy Deep Grayish Yellowish Green.