Crossword Genius

Gemstone weight unit (5)

Ross

I believe the answer is:

carat

'gemstone weight unit' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for carat that I've seen before include "Unit of weight for diamonds" , "Unit of gem measurement" , "Measure of fineness of gold" , "Measure of purity of gold" , "A unit of weight for precious stones" .)

I've seen this clue in the USA Today.
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