Carat refers to the weight of a diamond, not its size—though they are often related. One carat equals 0.2 grams, and diamonds are also measured in points (100 points = 1 carat). While carat weight often impacts price more than any other “C,” it doesn’t guarantee beauty.
Two diamonds with the same carat weight can appear different in size depending on their cut and shape. A well-cut diamond may look larger than a heavier, poorly cut one. For example, oval, marquise, and pear-shaped diamonds often appear bigger than round diamonds of the same carat weight.
Prices jump significantly at whole and half-carat weights (e.g., 0.99 ct vs. 1.00 ct). Consider buying just under a full carat to save money without sacrificing visual impact.