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Carat (Purity) - For other meanings, see Carat.
The carat is a measure of the purity of precious metals and their alloys, such as gold. One carat in this sense is one-twenty-fourth purity by weight. Therefore 24 carat gold is pure gold, 12 carat gold is 50% purity, etc. In the United States and Canada, the spelling karat is usually used for the measure of purity, while carat refers to the measure of mass.
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