This is the term with which people are most familiar, but bear in mind that carat is
specifically a measure of a diamond’s weight.

In metric terms, a carat is the equivalent of 200 milligrams. A carat is divided into
100 points, hence 50 points is the equivalent to ½ a carat and so on. Carat weight
does not give an accurate indication of a diamonds size. This means that it is possible
to have a diamond of a lower carat weight, but higher cut grade, which appears larger
than a diamond with a larger carat weight but poor cut.

In order to have an accurate indication of a diamonds size, it is important
to not only take into account the carat weight, but also take into account
two other characteristics including:

*Distance across the top of the diamond in millimetres.
*The diamonds cut grade.