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A carat is a unit of measurement used to weigh a diamond. One carat is equal to one fifth of a gram (0.2 gram) or 200 mg. One carat is equal to 100 points or 100 cents

Carat weight is the most objective of the 4 C’s of diamonds as it involves no estimates, comparisons or judgements.

visual effect of carat weight on a diamond's appearance seems fairly obvious: the more a diamond weighs, the larger it will look. However, this is not always the case. As most people in the trade already know, cut proportions can also affect the perceived size of a diamond.

Carat weight is directly related to a diamond's value because (all else being equal) larger diamonds are rarer than smaller ones. As a result, larger diamonds cost more per carat than smaller diamonds (e.g., a 2.00 ct diamond of the same quality can cost more than twice the amount of a 1.00 ct diamond).

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