Diamonds are available in more than a few carat weights, and the time period "carat" refers back to the diamond's weight, not its length. One carat is equivalent to two hundred milligrams. The smallest diamonds available are usually less than a carat, often called "tips" when they are less than one complete carat. Diamonds are commonly observed in sizes like 0.25 carats, 0.5 carats, and so on. however, the actual length of a diamond is decided with the aid of its aggregate of carat weight, cut, coloration, and clarity.