karat

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Karat

1. A way of measuring the mass of a gem. One karat is 200 milligrams.

2. A way of measuring the purity of gold or platinum. One karat is 1/24 purity; that is, 24 karat gold is pure gold.

In both cases, karat can also be spelled carat.

karat

A measure of the purity of gold. Pure gold is indicated by the label 24 karat. See also fineness.
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