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Diamond Carat Grading

Diamonds are sold by the carat (ct), not to be confused with karat (kt), which refers to gold purity. Since 1913, most countries have agreed that a carat weights 200 milligrams, or 1/5 gram.

Jewellers often refer to the carat weight of diamonds in terms of points. This is particularly true of stones under one carat. There are 100 points to a carat, so if a jeweller says that a stone weighs 75 points, he means it weighs 75/100 of a carat, or ¾ carat. A 25-point stone is ¼ carat. A 10-point stone is 1/10 carat.

The carat is a unit of weight, not size. We wish to stress this point, since most people think that a one-carat stone is a particular size. Most people, therefore, would expect a one-carat diamond and a one-carat emerald, for example, to look the same size or to have the same apparent dimensions. This is not the case.

Comparing a one-carat diamond with a one-carat emerald and a one-carat ruby easily illustrates this point. First, emerald weighs less than diamond, and ruby weighs more than diamond. This means that a one-carat emerald will look larger than a one-carat diamond, while the ruby will look smaller than a diamond of the same weight. Emerald, with a mineral composition that is lighter, will yield greater mass per carat; ruby, with its heavier composition, will yield less mass per carat.

Diamond prices are usually quoted per carat. Diamonds of the finest and rarest quality are sold for the highest price per carat, and diamonds of progressively less rare quality are sold for a progressively lower price per carat.

Diameters and Corresponding Weight of Round and Brilliant Cut Diamonds

Various diameters and corresponding weight of diamonds
Various diameters and corresponding weight of diamonds
Various diameters and corresponding weight of diamonds
Various diameters and corresponding weight of diamonds
Various diameters and corresponding weight of diamonds
Various diameters and corresponding weight of diamonds


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