A carat is a unit of weight, not of size. One carat is 200 milligrams, or 1/5 of a gram.
One-carat diamonds can vary in size, it depends on the cut of the diamond (round, princess, emerald etc), however there is a little more to that because there are "fat" rounds and "narrow" rounds etc. For example, a stone can be cut to make the top part wider and depth shorter, and the opposite etc
probably 6-7mm wide for a round one, depending on depth/height of the stone
The point unit—equal to 0.01 carat, or 2 mg is commonly used for diamonds of less than one carat.
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