Crossword Genius

Gemstone with a "fire" variety (4)

Ross

I believe the answer is:

opal

'gemstone with a fire variety' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for opal that I've seen before include "Birthstone for October" , "little jewel" , "Gem stone" , "Milky white gem" , "Semi-transparent gem" .)

I've seen this clue in The New York Times.
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