A carat is a small cut of a diamond. One carat diamond is smaller than a penny. The size is comparable to the diameter of an eraser on top of a pencil. Actually, a one carat diamond is smaller than that.
calebsmom, Shopping Expert
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A single carat diamond can have many looks, it all depends on the shape of the diamond. Diamonds come in a variety of shapes including princess, cushion, heart, pear, marquise, radiant, asscher, emerald, and oval.