As with all precious stones, the weight - and therefore the size - of a diamond is expressed in carats. One carat is divided into 100 "points" so that a diamond of 25 points is described as a quarter of a carat or 0.25 carats. Size is the most obvious factor in determining the value of a diamond, but now you know that two equal sizes can have very unequal prices depending on their quality. However, remember that diamonds of high quality can be found in all size ranges. Here are some other examples that show the approximate size of diamonds of varying carat weights.

Diamonds are weighed in metric carats. One metric carat equals 0.200 grams. One carat is equal to 100 points (50 points =1/2 carat).

The diameter of a diamond varies greatly with the same weight, deep vs. shallow cut.

Note: Forsythe Jewelers has an electronic scale to the nearest 1/2 of thousandths on the premises to weigh the difference.