Diamond carat weight is measured in carats and is not an indicator of size.
A diamond's weight is measured in carats which is the standard unit of weight for diamonds and other gemstones. Just as a dollar is divided into 100 pennies, a carat is divided into 100 points. You will often see a diamond referred to as a
3/4 carat stone = 75 point = 0.75 carat
Even though two diamonds can have the same carat weight, their measurements in millimeters can vary. So YES! It is possible for Two diamonds to have the same carat weight and yet be different sizes.
The weight of a diamond has the most significant impact on its price. Since the larger a stone is, the rarer it is, one 2 carat diamond will be more expensive than the total cost of two 1 carat diamonds of the same quality.
Diamond buying is all about making small trade-offs to maximize the criteria you care most about, whether that means getting the largest diamond or the highest quality stone (or somewhere in between) is a matter of preference that every buyer must determine. One thing you should know before you begin investigating trade-offs is that going one grade lower in clarity will save you less than going one grade lower in color.