Crossword Genius

Birthstone for most Libras (4)

Ross

I believe the answer is:

opal

'birthstone for most libras' 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 "One's stony" , "National gemstone of Australia" , "Lustrous stone" , "Milky stuff that's hard" , "it may be highly valued" .)

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