Carat Sizes | Carat Weight

Diamond Carat Weight

Carat weight is pretty black and white. Diamonds are weighed in carats, which are composed of 100 points. Basically, a half-carat stone is 0.50 carats or 50 points. Carat is abbreviated as "ct." Special diamond scales calibrated to one thousandth of a carat are generally used in the jewelry trade, so diamonds are weighed to the thousandth and rounded to the hundredth of a carat. Occasionally you may hear the term "four grainer" referring to a 1-carat stone. Each grain is equal to 0.25 carat or 25 points. If you think in terms of grams, 1 gram is equal to 5 carats. This metric equivalency provides a level of uniformity anywhere in the world.

Due to the limited supply of larger diamonds, the value of a diamond rises disproportionally as the weight of the stone increases. For example, four 0.25-carat diamonds of the equivalent quality will not equal the value of a single 1-carat stone of identical quality. The disparity becomes more noticeable as the size and quality of the diamond increases.