One of the four Cs is carat, which determines the size of a diamond. Diamonds are always measured by weight, with one carat the equivalent of 1/5th of a gram or 200 milligrams.

One of the four Cs is carat, which determines the size of a diamond. Diamonds are always measured by weight, with one carat the equivalent of 1/5th of a gram or 200 milligrams.

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