Crossword Genius

Yellowish, bluish or colourless precious stone (5)

Ross

I believe the answer is:

topaz

(Other definitions for topaz that I've seen before include "Precious stone - dark yellow colour" , "valuable item" , "Precious stone - American hummingbird" , "Shade of yellow -- gem" , "Type of gemstone" .)

I've seen this clue in The Telegraph.
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