![]() ![]() ![]() In the United Kingdom the original Board of Trade carat was exactly 3 + 1647⁄ 9691 grains (~3.170 grains = ~205 mg) in 1888, the Board of Trade carat was changed to exactly 3 + 17⁄ 101 grains (~3.168 grains = ~205 mg). ![]() Historical definitions Carat before 1907 Location It was soon made compulsory by law in France, but uptake of the new carat was slower in England, where its use was allowed by the Weights and Measures (Metric System) Act of 1897. A metric carat of 200 milligrams – exactly one-fifth of a gram – had often been suggested in various countries, and was finally proposed by the International Committee of Weights and Measures, and unanimously accepted at the fourth sexennial General Conference of the Metric Convention held in Paris in October 1907. Standardization Īn 'international carat' of 205 milligrams was proposed in 1871 by the Syndical Chamber of Jewellers, etc., in Paris, and accepted in 1877 by the Syndical Chamber of Diamond Merchants in Paris. Beginning in the 1570s, it was used to measure weights of diamonds. In the past, each country had its own carat. However, this was a factual inaccuracy, as their mass varies about as much as seeds of other species. History Ĭarob seeds have been used throughout history to measure jewelry, because it was believed that there was little variance in their mass distribution. It was a unit of weight, equal to 1/1728 (1/12 3) of a pound (see Mina (unit)). Etymology įirst attested in English in the mid-15th century, the word carat comes from Italian carato, which comes from Arabic ( qīrāṭ قيراط), in turn borrowed from Greek kerátion κεράτιον ' carob seed', a diminutive of keras 'horn'. The ANSI X.12 EDI standard abbreviation for the carat is CD. In terms of diamonds, a paragon is a flawless stone of at least 100 carats (20 g). Other subdivisions, and slightly different mass values, have been used in the past in different locations. The carat is divisible into 100 points of 2 mg. The current definition, sometimes known as the metric carat, was adopted in 1907 at the Fourth General Conference on Weights and Measures, and soon afterwards in many countries around the world. The carat ( ct) is a unit of mass equal to 200 mg (0.00705 oz 0.00643 ozt), which is used for measuring gemstones and pearls. Diamond-weighing kit, with weights labelled in grams and carats ![]()
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