Crossword Genius

Milky-colored gemstone (4)

Ross

I believe the answer is:

opal

(Other definitions for opal that I've seen before include "One's stony" , "raw material" , "Semi-transparent gem" , "Semi-precious stone of milky or bluish colour" , "Variegated gemstone" .)

I've seen this clue in the Newsday.
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