Crossword Genius

Shimmery stone (4)

Ross

I believe the answer is:

opal

'shimmery stone' 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 "Opaque mineral used a gemstone" , "Milk-coloured gemstone" , "Milky-white gem" , "Opaque gem" , "One in a ring perhaps" .)

I've seen this clue in The Wall Street Journal.
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