Crossword Genius

A measure of the purity of gold (5)

Ross

I believe the answer is:

carat

(Other definitions for carat that I've seen before include "small weight" , "weight of rocks" , "Unit of weight for gems or purity of gold" , "Gem weight unit" , "A unit of weight for precious stones" .)

I've seen this clue in the Sydney Morning Herald.
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