Carat weight is the weight of the diamond measured in carats.  A diamond weight is simplistic of its characteristics to measure, and from the earliest times it was used to calculate a diamond's value.

Five carats are equal to one gram, each carat is divided into 100 points.  A diamond that weighs 25 points is ¼ of a carat.  When you talk about carat weight (ct) you're talking about diamond size.

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