4C's: Carat

Carat is the term used to describe the weight of any gemstone, including diamonds. Diamond weights are stated in metric carats or "ct" (versus the karat amount of gold contained in an item). Since 1913 the international standard has been 1 carat = 200 miligrams, or 1/5 of a gram. In jewelry pieces with more than one diamond, the carats may be described in terms of total carat weight (TW). This number is the combined total weight of all stones in the piece.
CARAT SCALE