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A measure of weight for gemstones, in use since antiquity. The name is derived from keration, Greek for kernel of the carob bean. A carat weighs 200 milligrams. Carat is also the name used by goldsmiths to measure the purity of gold. Pure gold is 24 carats; most gold used for jewellery is 9 or 18 carats.

Subjects: Art.

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