Crossword Genius

Australian gem (4)

Ross

I believe the answer is:

opal

'australian gem' 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 "Lustrous stone" , "Gem with delicate colours" , "Milky iridescent stone" , "Milky-white gemstone with flashes of colour" , "it may be highly valued" .)

I've seen this clue in the USA Today and the Universal.
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