Diamond carat weight is the measurement of how much a diamond weighs. A metric “carat” is defined as 200 milligrams. Each carat can be subdivided into 100 ‘points’. This allows very precise measurements to the hundredth decimal place. Sometimes when describing the weight of a diamond that is below one carat, it is often referred to by ‘points’ alone. It can also be referred to as a fraction. For instance, a diamond that weighs 0.25 carats is often described as a twenty-five pointer or as ¼ carat. Diamonds weighing greater than one carat are usually expressed as whole numbers decimals shown to two decimal places. All else being equal, diamond price increases with diamond carat weight because larger diamonds are rarer and more desirable. But two diamonds of equal carat weight can have very different values (and prices) depending on three other factors of the diamond 4Cs. It’s important to remember that a diamond’s value is determined using all of the 4Cs, not just carat weight.