Carat weight is the measure of the weight of the diamond stone. The history of diamonds mentions that the word “carat” was derived from the name of the seeds of the tropical carob tree, the “cattie” or “carat.” Moreover, it is said that the first people to know about diamonds at around seven to eight centuries before Christ are the Dravidians of India, who used the cattie or carat seeds in weighing diamonds in a scale. Hence, to date, the seed is alleged still used by some in measuring the weight of a diamond in a scale. In common parlance, Carat  is often associated with the size of the diamond, as people associate bigger stones with higher the Carat. This makes sense in a way, in that bigger stones could have higher weight. Yet technically, in diamond grading, carat weight employs a point system in which one carat is equivalent to 100 “points” and five carats is equal to one gram of the metric unit.

In order to get the accurate Carat weight measurement of diamonds in jewelry, gemologists recommend that the stone be taken out of the setting for measurement. This may entail removal of the diamonds from the ring or any other piece of jewelry where they are lodged. There are tools that could approximate carat weight without removal from the setting, such as caliper setting and measures, but these, understandably, are not as accurate as when measurement is done out of the setting and thus, must not be mistaken as measures of true diamond value.