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See also:CARAT (Arab. Oral, See also:weight of four grains; Gr. Kep6Tro11, little See also:horn, the See also:fruit of the carob or See also:locust See also:tree) , a small See also:weight (originally in the See also:form of a See also:seed) used for diamonds and See also:precious stones, and a measure for determining the fineness of See also:gold . The exact weight of the See also:carat, in practice, now varies slightly in different places . In 1877 a See also:syndicate of See also:London, See also:Paris and See also:Amsterdam jewellers fixed the weight at 205 milligrammes (3.163 See also:troy grains) . The See also:South See also:African carat, according to See also:Gardner See also:Williams (See also:general manager of the De Beers mines), is equal to 3.174 grains (The See also:Diamond Mines of South See also:Africa, 1902) . The fineness of gold is measured by a ratio with 24 carats as a See also:standard; thus 2 parts of alloy make it 22-carat gold, and so on . |
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