Carat weight, CT, is the standard unit of weight measurement for a diamond. Actually it refers to a diamond’s weight, not size! Comparing to diamond cut and carat, a larger carat diamond with poor cutting can appear smaller than a small carat diamond with higher cut grade.
Diamond prices jump at the half and full weight. Diamonds below these weight cost significant less because larger diamonds are rarer and more desirable.
BUYING TIPS: In order to fit your budget, select a carat weight slightly below the whole carat marks. For example, consider buying a 1.9 carat weight diamond instead of 2.0 carat diamond and this will save a considerable amount of money.