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 0.25 carats as a ‘twenty-five pointer.’ Diamond weights greater than one carat are expressed in carats and decimals. A 1.08 carat stone would be described as ‘one point zero eight carats.
Diamond Carat Weight | GIA Video
GIA created the 4Cs (Color, Clarity, Cut, and Carat Weight) over 50 years ago as a universal method for establishing the quality of any diamond, anywhere in the world. The 4Cs mean two very important things: diamond quality can be communicated in a universal language, and diamond-buying consumers can know exactly what they are about to purchase.