Karat
Part of speech: noun
Definition: A unit of fineness or concentration equalling 1/24 parts gold in an alloy.
Carat
Part of speech: noun
Definition: A unit of weight for precious stones and pearls, equivalent to 200 milligrams.Formerly, any of several units of weight, varying from 189 to 212 mg, the weight of a carob seed.A measure of the purity of gold, pure gold being 24 carats.