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En joaillerie, le carat est une unité de masse utilisée pour les gemmes, à ne pas confondre avec le carat des bijoutiers désignant la pureté d'un métal dans certains pays. En 1907 , le carat (métrique) est défini par la 4 e Conférence générale des poids et mesures (CGPM) comme étant égal à 200 mg , soit 5 carats pour 1 ...
Gemology or gemmology is the science dealing with natural and artificial gemstone materials. It is a geoscience and a branch of Stoneology and mineralogy. Some jewelers (and many non-jewelers) are academically trained gemologists and are qualified to identify and evaluate gems. [1] [2]
In 1953 the GIA developed its International Diamond Grading System and the "four Cs" (cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. Today, [when?] the institute is headquartered in Carlsbad, California, and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 ...
- 21 Gemology & 9 Jewelry Arts Instructors
- Private
- 1931
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. 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.
- 200
- ct
- 0.00705
Na joalheria, o quilate é uma unidade de massa usada para gemas, não deve ser confundida com o quilate dos joalheiros que designa a pureza de um metal em alguns países. Em 1907, o quilates (métrica) é definida pela 4 th Conferência Geral de pesos e medidas (CGPM) como sendo igual a 200 mg ou 5 quilates por 1 grama.
Carats are the units used to measure gem weight and one of the main factors in gem grading. Learn what affects the price per carat of various gem species.
carat, unit of weight for diamonds and certain other precious gems. Before 1913 the weight of a carat varied in different gem centres. Originally based on the weight of grains or leguminous seeds, which, of course, varied in size from place to place, the carat was equivalent to 0.2053 gram (3.168 troy grains) in London, 0.1972 g in Florence, and 0.
