This is the weight of a diamond measured in carats. One carat is divided into 100 "points", so that a diamond of 75 points weighs .75 carats. Carat-weight is the easiest of the 4C`s to determine. But two diamonds of equal weight can have very unequal value, depending on their cut, color and clarity. Carat Weight
The weight of a diamonds is generally given in carats. The term carat originated in ancient times when gemstones were weighted against the carob bean. Each bean weighed about one carat. In 1913, carat weight was standardized internationally and adapted to the metric system. One carat equals 0.2 grams - a little more than 0.007 ounce. In other words, it takes 142 carats to equal 1 ounce.
Two terms, carat and karat are often confused. Karat refers to the fineness of gold alloys (pure gold is 24 karat; 14 karat is 14 parts gold and 10 parts other metals) and carat refers to gem weights.
The weight of small diamonds is frequently expressed in points, with one point equaling 0.01 carats. For example, five points is a short way of saying 5/100 of a carat and fifty points equates to a half carat.
Sometimes in the jewelry trade, the term size is used as a synonym for carat weight. This is because small round diamonds having the same weight also look the same size and similar diameters. As diamonds increase in weight, their size becomes less predictable. Diamonds with a shallow cut can have a greater diameter than a deeper cut diamond with the same weight. However, you don`t want the diamond to be too shallow or it will not reflect the light properly and will have less brilliance.
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