Diamond Carat

The carat is the standard unit of measurement used to weigh, not the size, of a gemstone. There are 100 points to a carat and one carat is equal to 200 milligrams. Therefore a 50 point diamond is 1/2 a carat, or 100 milligrams. Larger diamonds are found relatively infrequently in nature and are therefore more valuable. The cost of a diamond increases exponentially with its weight. Thus the larger the diamond the more expensive per carat. For example 1-carat diamond will cost more than twice a 1/2-carat diamond, all other things considered. However, the cut and mounting can make a diamond appear larger or smaller than it actually is..