Measurements of gems and gold (6)

I believe the answer is:

carats

(Other definitions for carats that I've seen before include "Weights of gold" , "Units of weight of precious stones" , "Jewellers measure" , "They're used to measure gems and express purity of gold" , "Units of weight of diamonds" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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