NDCarat is a measure of weight, not size. One carat is equal to 200 milligrams. The term is derived from the word ‘carob’.
Carob seeds were used as a reference for diamond weight in the ancient world. Because larger diamonds are rare, they are more valuable than the equivalent weight in several smaller diamonds. A one carat diamond will generally cost more than two half-carat diamonds, assuming all other qualities are equal.
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