the answer to the crossword clue "Assayer’s unit" is karat. A karat is a unit of purity for gold and other precious metals. It is equal to 1/24 of pure gold.
For example, 18 karat gold is 18/24 pure gold, or 75% pure gold. 24 karat gold is pure gold.
The karat is named after the carob bean, which was used as a weight in ancient Egypt.
I hope this helps!
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