Diamond Basics: Weight
A carat is the measure of weight of a diamond not to be confused with karat, the method of determining the purity of gold.
Carat Weight: One carat equals 1/5 of a gram in weight
For diamonds under a carat, each carat is divided into 100 points – similar to pennies in a dollar. 0.75ct. = 75 points, ½ ct. = 50 points.