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carat (noun) the unit of weight of precious stones like diamond; the measure of the purity of gold.
Precious stones like gems are weighed in carats (also karats). In the case of the weight of the precious stones a carat is equal to two hundred milligrams. The finest gold is of twenty-four carat purity. Jewels are usually made of purity ranging from eighteen carats to twenty-two carats.
- The diamond found near the dead volcano weighed twelve carats, and in the opinion of the assessor, was pure and could fetch at least half a million dollars.
- The caps of the expensive pens are of eighteen carat gold and retain their shining for five to six years, according to the brochure given with the pens.