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Half carat diamond rings US online shop today: Carat weight is sometimes expressed in “points”. These are percentage points of a carat where one point equals 1/100th of a carat, so 25 points is equal to a quarter of carat and 50 points is equal to half of a carat. In early times diamond weight was also compared to grains of rice. Four grains of rice were equal in weight to a carob bean. Diamond dealers still use the term when referring to general sizes such as “three grainer” for diamonds in the .70-.79 ct range, or “five grainer” for diamonds in the one and a quarter carat range. Cost, which is sometimes referred to as the 5th C, is to some extent driven by rarity factors that don’t impact…