The term "Carat" refers to the weight of a diamond. It is derived from the carob seeds, which are remarkably consistent in weight and shape and so were the favored scale balances in ancient times. This was standardized in 1907 and after that 1 carat became 0.2 grams or 1/142 of an ounce. Furthermore, each carat is divided into 100 points. Therefore, ¼ carat diamond is considered as 25 points and ½ carat diamond is considered as 50 points and so on. This term 'Carat' is different from the term 'Karat' which is used to describe gold's fineness or purity. When we consider all four Cs, that determine value of diamond, we can find Carat weight most accurately and easily by using a delicately balanced scale capable of weighing extremely small stones.
Diamond's Carat Weight Scale
There is one significant fact about diamond’s weight and price. When diamonds are mined, large diamonds are discovered rarely in comparison of small ones, which make large diamonds much more valuable. For that reason, the price of a diamond rises exponentially with its size. So, a 2 carat diamond of a given quality is always worth much more than two 1 carat diamonds of the equal quality. Although larger stones are often more highly valued, but size should not be the only consideration. High brilliance, which varies according to clarity, cut, and color grade, is highly desirable in a diamond.