Carat
a weight of 3½ grains; the It is twenty-fourth part of an ounce. to be divided into 24 parts, and said to of gold, the whole mass being supposed be so many carats fine, according to the gold contained in it. Twenty-four carat number of twenty-fourth parts of pure means all gold, 18 carat three-quarters States gold coinage is in these proporgold. Fine gold consists of 22 carats of pure gold and two of alloy. The United States gold coinage is in these proporother precious stones equals 200 milligrams (3.086 grains).