The carat weight
The carat is the unit of weight used to measure a diamond. Today, one carat equals exactly 0.20 grams and is one of the four fundamental criteria defined by the GIA for diamond evaluation.
Understanding diamond carat weight
The term carat originates from antiquity, when carob seeds were used as a reference weight for precious stones.
What carat weight really indicates
Carat refers to weight, not absolute visual size.
Two diamonds with the same carat weight may have different dimensions depending on their proportions and how the stone is cut.
At equal weight, a diamond with balanced proportions will present a more consistent visible surface and a clearer overall appearance.
Our guidelines for comparing carat weights
Comparing diamonds by carat weight helps identify price differences related to weight, as well as to other essential criteria: proportions, color and clarity.
The carat ranges displayed below allow you to refine your search and access diamonds that correspond to your comparison objective.