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Diamond Carats Carat refers to the standard unit of measure for diamonds and other gemstones. One carat is equal to 1/5 of a gram, or 1/142 of an ounce. The carat is also referred to as containing 100 “points”. A 50-point diamond weighs ½ carat and a 25-point diamond weighs ¼ carat. The price per carat of diamonds can at times increase exponentially with size, due to the rarity of larger gemstones. A one-carat diamond could cost 3.5 to 4 times what an equivalent ½ carat costs, depending on the rarity the stone. The same goes for subsequent increases in size. Back to Previous Page Home Page Products Map and Location Knowledge Center Services Resources Search Contact Us