Crossword Genius

Fiery gemstone (4)

Ross

I believe the answer is:

opal

'fiery gemstone' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for opal that I've seen before include "Quartz-like gemstone" , "Mineral, usually iridescent" , "Gem stone" , "often semi-transparent" , "Glassy gemstone" .)

I've seen this clue in the Penny Press.
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