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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.
A pure, 1-carat diamond can easily fetch a price in the six digits per gram. Prices can vary dramatically based on color, cut and other factors. Rob Lavinsky / Wikimedia Commons CC-BY-SA 3
Gems that are of lower saturation, or are too dark or too light in tone are of less value. However, color preferences are a personal taste. [5]: 333–401 The 423-carat (84.6 g) Logan sapphire in the National Museum of Natural History, in Washington, D.C., is one of the largest faceted gem-quality blue sapphires in existence.
One carat is defined as 200 milligrams (about 0.007 ounces avoirdupois). The point unit—equal to one one-hundredth of a carat (0.01 carat, or 2 mg)—is commonly used for diamonds of less than one carat. All else being equal, the price per carat increases with carat weight, since larger diamonds are both rarer and more desirable for use as ...
Lily Gabriella's "Memphis Deco Pin," is crafted in 18-carat rose gold and platinum and features a 7.34 carat grey spinel cushion, princess cut pink sapphires and custom cut lapis lazuli (price on ...
That amount, plus the reported sale to the King, would have totaled about 720,000 livres, half the price of Tavernier's initial estimate for the gem. [34] There has been controversy regarding the actual weight of the stone: Morel believed that the 112.1875-carat (22.43750 g; 0.791460 oz) [ 5 ] stated in Tavernier's invoice would be in old ...