The weight establishes the price of a Diamond and it is expressed by carats, the precision balance is calibrated to 1/100.000 grams.

Like all precious stones, Diamonds are measured in carats (symbol Kt.) that is a measure of weight.

The word carat derives from the ancient system of weight that used the seed of carob bean like unit of measure, later the carat was fixed to 0,2 grams that is 1\5 of gram. A carat is divided by 100 Points, so 25 points (0,25 Kt.) are equal to 1\4 of carat.