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Carat - The weight

Carat is an ancient inherited unit of weight in which gemstones are measured. The word "carat" traces back to the seed of the carob tree, which was used as the unit of measurement for diamonds in the past. Its grains have a constant average weight of 0.2 grams. Even today, we refer to "carat" as a unit of weight. It should not be confused with the German word "karat," which is spelled with a "K." In this context, for example, 18 karat refers to 750 gold. It is important to consider the carat weight of a diamond together with its cut. If the diamond's cut is poorly executed, even a high carat weight will appear dull. Diamond prices are always indicated as p.ct (per carat).

Verlobungsring Frankfurt

Size chart for carat weight

Diamant Tabelle.png

The size of a 1-carat diamond can vary slightly depending on how the stone is cut, even when the diamond shape is the same. Larger rough diamonds are rarer than smaller diamond crystals, which is why the prices per carat do not increase proportionally. The illustration is meant to give you a sense of the relationship between carat weight and the diameter of a brilliant-cut diamond. However, please note that the illustrations are not to scale.

The 4 C

large natural solitaire rough diamond being inspected in auction in Antwerp Belgium.jpg


What means carat?

African woman working in a diamond polishing wheel machine.jpg


What means cut?

Process of appraising diamonds by diamon


What means clarity?



What means color?

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