First of all, weighing small and precious diamonds requires very fine and consistent weight units. Early jewelers mostly used plant seeds with the same volume and weight as the weighing unit. Mi Dou and wheat ears were first adopted. Ear of wheat is a kind of grain with even weight. Today's units of measurement, such as pearl grains, gold balance grains, constant weight system and drug measurement, all come from wheat ears.

Second, the beans produced by the rice bean tree, or Robinia pseudoacacia, are still important raw materials for poultry and livestock feed and spices until today. Merchants used this bean as a unit of weight, from which today's metric carat came.

Third, carat weight was unified and standardized in the early 20th century.

4. 1 carat = 200mg.

How many grams is a carat?

Carat (Ct) is the weight unit of precious stones, and now 1 carat is equal to 0.2g or 200mg .. one carat minute 100 minute, for example, 0.5 carat in 50 minutes. Klajo's 205.3 mg in the old gem book, if converted into the current carat, then one carat will be multiplied by 1.0265. This is only a general description, because the carat value of different countries or regions in the old days was different.

How on earth did a carat come from?

From 65438 to 0983, Mr. Tao of Chengdu Institute of Geology conducted a specific study, which confirmed that carat originated from the seed of carob tree in the Mediterranean region-rice bean. The weight of this tree is about 200mg, which has nothing to do with the weight of Robinia pseudoacacia, Pittosporum and Sophora japonica.

Oz (translated from Hong Kong into ounces) is an English unit of measurement, and the symbol is ounce or ounce. As a unit of weight, it is also called English ounces.

Constant ounce: a unit of weight. The overall abbreviation is oz.av

1 oz = 28.350g.

1 oz = 16 dram.

16 oz = 1 lb (pound)

Troy ounce: A unit of weight. The overall abbreviations are oz.tr (English) and oz.t (USA). Common in the measurement of precious metals such as gold and silver.

1 oz = 31.1035g.

12 oz = 1 lb.

Drug balance ounce: unit of weight, abbreviated as ap oz as a whole.

1 oz = 31.1030g.

Liquid ounce: the unit of capacity measurement, with the symbol of ounce.

1 British liquid ounces =28.4 1 ml

1 American liquid ounces = 29.57ml

The units of ounces used in different fields are different. As mentioned above, there are ounce units used to measure gold, drugs and general goods, as well as liquids. For the specific conversion of gram/volume, see above.