carat

1. a measure of the weight of precious stones, esp diamonds. It was formerly defined as 3.17 grains, but the international carat is now standardized as 0.20 grams

2. a measure of the proportion of gold in an alloy, expressed as the number of parts of gold in 24 parts of the alloy

Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

carat

[′kar·ət]

(lapidary)

A unit of weight of gemstones, equal to 200 milligrams. Also known as metric carat.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Carat

a unit of weight, abbreviated kar. in Russian and ct internationally, which is used in the jewelry trade for measuring the weight of precious stones and pearls. The carat is used in a number of countries to indicate the purity of precious metal alloys. The metric carat, which was established by the fourth General Conference on Weights and Measures (Paris, 1907) and adopted in the USSR in 1922, is equivalent to 200 mg (exactly) or 2 X 10⁴ kg.

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