A diamond's weight is measured in carats, the easiest of the 4 C's to determine. Each carat is divided into 100 parts called points. A half carat diamond is equal to 50 points or 0.50 carats. Carat weight does not refer to the size of a stone. A 1 carat ruby will not have the same geometric measurements as a one carat diamond. Ruby's weigh more than diamonds. Two diamonds of equal size can differ in value due to its color, clarity, and cut. The price per carat can increase exponentially as diamonds increase in size. Two diamonds, weighing 0.50 carats and the other weighing 1.00 carat, with equal cut, color, and clarity will have significant cost differences. < Back to The 4 C's