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, [1][2] and soon afterwards in many countries around the world.
How much is a carat? If carat is serving as a variant spelling of karat, then it is measuring the fineness, rather than the weight, of gold; each carat is equal to 1/24 part of pure gold. If carat is being used in reference to precious stones, it is a unit of weight equal to 200 milligrams.
A carat is a unit of weight used to measure gemstones and pearls. One carat equals 200 milligrams or 0.2 grams. The heavier the stone, the higher its carat weight. Important note: Carat weight is not the same as gemstone size.
In the jewelry world, 'carat' typically describes a unit for weighing precious stones, while 'karat' refers to the amount of gold in a piece. Learn about the tree the words come from by reading more.
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One carat is precisely equivalent to 200 milligrams (.2 grams). The name “carat” originates from the carob seed, which ancient Mediterranean traders used as a natural standard for weighing precious stones due to its remarkably consistent mass.
Precious jewels are measured in carats instead of ounces or grams. If your sister gets a three- carat diamond ring, she's getting a ring that weighs 600mg, which is big enough to be called "a rock." A variant of carat is karat.