To understand diamond size, carat weight should be taken into consideration with:

– Distance in millimeters across the top of the diamond.

– Diamond's cut grade.

A carat is a unit of measurement and 1 carat is equal to 200 milligrams or 0.2 grams. Hence a 1.25 carat diamond will weigh 250 milligrams.

The larger the diamond is, the rarer it is, and therefore, the price per carat increases, as the diamond gets larger. However, carat weight has no influence on diamond color, clarity, or cut. All other things being equal, a 2 carat diamond will always be worth more than two 1 carat diamonds.

The size or carat weight of a diamond cannot be used alone to determine the value of a diamond. A large diamond will not be as valuable if it does not show good color, a fine cut or excellent clarity. All factors (cut, color, clarity and carat weight) are used together to determine the value of a diamond.

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