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Carat Weight The size of a diamond is measured in carats.  Each carat is subdivided into 100 points, therefore, a diamond weighing 86 points weighs 0.86 carats. Although size is the most obvious factor in determining the value of a diamond, bigger diamonds are not necessarily of a higher quality.  Two diamonds of equal size can therefore have different values because one is of better quality than the other, and it is worth remembering that high quality diamonds are available in different sizes and shapes.