Crossword Genius

The traditional birthstone for November (5)

Ross

I believe the answer is:

topaz

(Other definitions for topaz that I've seen before include "Yellow or pale blue gem" , "White or colourless gemstone" , "Silicate gemstone" , "Yellowish-brown gemstone" , "South American hummingbird" .)

I've seen this clue in The Independent.
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