A diamond’s weight is expressed in carats, and one carat is roughly equivalent to 200 milligrams. Each carat has 100 points, and fractions of a carat can be decimally expressed as equivalent points. For example a 3/4-carat diamond has 75 points.
The complication of decimally expressing fractional carat weight is the industry norm of giving fractional carat weight a broad decimal range to maintain its qualification within a particular fractional carat weight. For example, a 1/2-carat diamond may have between 45 and 58 points and still be considered a 1/2-carat stone.
Diamond prices may increase disproportionately with the size of a stone because larger-sized diamonds are more rare.
While it is a primary measure of a diamond’s value, carat weight in no way exceeds the importance of cut, clarity and color in estimating the worth of a diamond. All 4Cs must be taken into consideration when looking for the best diamond to meet your budget.