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The Probert Encyclopaedia of General Information

CARAT

Carat is the unit of measurement of gold purity - the proportion of gold to other metals in the alloy, expressed in 24ths. Coinage contains 22 parts of gold and is therefore described as 22 carat, pure gold is 24 carat. The carat is also a unit of weight, equal to 3.17 troy grains, used in the weighing of precious stones.
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