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This is the weight of the diamond measured in carats. One carat is divided into 100 "points", so that a diamond of 75 points weighs .75 carats. Carat-weight is the easiest of the 4C's to determine. But two diamonds of equal weight can have very unequal value, depending on their cut, color and clarity. Fine quality can be found in diamonds of all shapes and sizes.   

It is very important to know how carat weight affects price. Common sense might tell you that ten .10 ct. diamonds totaling a carat should be equal in price to four .25 ct. diamonds, or two .50 ct. diamonds when all are of the same quality. However, this is not so in the diamond trade. Because a large diamond of a given quality is rarer than a small diamond of the same quality, the larger the diamond of a given quality, the more it will cost per carat. Diamonds are separated into price per carat categories according to carat weight ranges. Each time you increase the carat weight range, the price per carat will increase for any given quality.