Car"at(kr"t), n. [F. carat (cf. It. carato, OPg. quirate, Pg. & Sp. quilate), Ar. qrt bean or pea shell, a weight of four grains, a carat, fr. Gr. kera`tion a little horn, the fruit of the carob tree, a weight, a carat. See Horn.] 1. The weight by which precious stones and pearls are weighed.
carat equals three and one fifth grains Troy, and is divided into four grains, sometimes called carat grains. Diamonds and other precious stones are estimated by carats and fractions of carats, and pearls, usually, by carat grains.
2. A twenty-fourth part; -- a term used in estimating the proportionate fineness of gold.
A mass of metal is said to be so many carats fine, according to the number of twenty-fourths of pure gold which it contains; as, 22
carats fine (goldsmith's standard) = 22 parts of gold, 1 of copper, and 1 of silver.
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Tue 18th December 2018