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Each diamond is weighed on a diamond scale to determine its carat weight. Each carat is 100 points, therefore while a 100 point diamond is one carat, a diamond that is 50 points is considered a half carat.

A diamond's value is directly related to its carat weight. Because larger diamonds are much more rare, their value increases exponentially with carat weight. For this reason, a 2 carat diamond will always be worth more than two 1 carat diamonds of the same quality.