Crossword Genius

Birthstone after sapphire (4)

Ross

I believe the answer is:

'birthstone after sapphire' 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 "Rock" , "Semi-precious stone of b;uish white colour" , "Many-coloured gem" , "Quartz-like gemstone" , "what may be set in 29 [DIAL]" .)

I've seen this clue in The Wall Street Journal, the LA Times and The New York Times.
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