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The carat of a diamond refers to it's physical weight. A carat weighs 0.200 grams. Each carat contains 100 points, so for example, half a carat equals 50 points.

Diamonds become more and more difficult to find in gem quality the heavier they become. Thus a diamond twice the weight of another diamond is generally greater than twice it's price.

A correctly proportioned diamond of a certain weight should look a certain size. For example a 1.00ct stone should measure approximately 6.5mm across. Some diamonds are cut out of proportion in order to retain unnecessary carat weight or make a shallow stone look larger than it actually is. This will detract from the beauty and sparkle of the diamond. For information on this please read our section on cut.