Diamond carat weight is the measurement of how much a diamond weighs. A metric “carat” is defined as 200 milligrams or one-fifth of a gram. Each carat can be subdivided into 100 ‘points.’ This allows very precise measurements to the hundredth decimal place. A jeweler may describe the weight of a diamond below one carat by its ‘points’ alone. For instance, the jeweler may refer to a diamond that weighs 0.50 carats as a ‘fifty pointer.’ Diamond weights greater than one carat are expressed in carats and decimals.
(Note – a round diamond weighing 0.95 carats, with an ideal or excellent cut grade, may seem to be bigger to the eye than many diamonds of one carat and more that have a lower cut grade. It’s not just weight that matters, it’s the appearance)