Diamond carat weight is the measurement of how much a diamond weighs. A metric "carat" is defined as 200 milligrams. Each carat can be subdivided into 100 "points". This allows very precise measurements to the hundredth decimal place. A jeweler may describe the weight of a diamond below one carat by its "points" alone. For instance, the jeweler may refer to a diamond that weighs 0.25 carats as a "twenty-five pointer". Diamond weights greater than one carat are expressed in carats and decimals. A 1.08 carat stone would be described as "one point oh eight carats".

A Diamond's Weight

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Carat

All else being equal, diamond price increases with diamond carat weight, because larger diamonds are more rare and more desirable. But two diamonds of equal carat weight can have very different values (and prices) depending on three other factors of the diamond Four C's: Clarity, Color, and Cut.


It's important to remember that a diamond's value is determined using all of the Four C's, not just carat weight.