Crossword Genius

Autumnal birthstone (4)

Ross

I believe the answer is:

opal

'autumnal birthstone' 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 "Milky-white gem" , "Quartz-like gemstone" , "One's stony" , "Form of hydrated silica, often used as a gemstone" , "Gem with delicate colours" .)

I've seen this clue in the USA Today, the Universal, the King Feature Syndicate and the Thinks.com.
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