Carat, as a unit of weight, originates from the seeds of a carob tree on the Mediterranean Sea in Europe. Carob has a peculiar phenomenon. No matter where it grows, the fruit it bears has the same weight. In history, this fruit has been used as a weight for measuring weight, and over time it has become a unit of weight, which is used to refer to valuable and subtle items. It was not until 1907 that it was internationally agreed to be a unit of measurement for gemstones.
Conversion of industry units:
1 gram (g) = 5 carats (ct)
1 carat (ct) = 0.2 g (g)
1 carat (ct) = 100 points (point)
1 point (point) = 0.01 carat (ct)
1 carat (ct) = 4 grains (gr)
1 grain (gr) = 0.25 carats (ct)
1 kg (kg) = 32.15 troy ounces (oz.tr)
1 gram (g) = 0.03215 ounces (oz.tr)
1 troy ounce (oz.tr) = 31.1035 g (g)
1 troy ounce (oz.tr) = 480 grains (gr)
In the international diamond market, the weight of the diamond is usually two digits after the decimal point, and the third is the nine-in-one, rather than rounding. Domestic testing institutions are accustomed to retain three places, that is, if the weight of a diamond is 0.599ct, the international certificate will be marked with 0.60ct, and the domestic certificate will be 0.599ct. The price will usually be one unit: 20-29 points, 50 -59 points. For the fraction of the integer, there is a "carat premium" between the prices of the diamonds. Even if it is only 1 point difference, the price of 99 points and 1ct diamonds is far from each other.
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