The prices of gems of the same quality are determined by their weight. The heavier the stone, the higher its price per unit weight or price per carat value. Smaller stones are more common and therefore their price per carat is lower than the larger ones.
Carat (or metric carat) refers to the standard accepted unit of weight for Diamonds and Gemstones.
The source of the name comes from the Latin word "ceration," which means – the seed of a carob, taken from the ancient practice of weighing gems against the seeds of the carob tree.
One carat is equal in weight to 0.200 grams (1 carat = 0.2 gram.)
To ease the work with small stones (especially Diamonds), the carat unit is divided into 100 points. The use of points helps us to be precise in determining the weight of the stone.
1 carat = 100 points.
For example: a half a carat stone weighs 50 points.
Carat is measured at the EGL Platinum laboratory using high-precision electronic equipment and rounded to the nearest thousandth of a carat (point.)