But this shape can decrease the stones luster by harming its brilliance or scintillation.Īnd if a diamond is cut too thin, it will lack all sparkle, which would effectively ruin it. Generally, a stone that is cut to be wider and flatter will appear larger than its carat rating would imply. And just because two stones have the same carat rating does not mean that they will be cut in the same way. Gem-cutters can choose to emphasize certain qualities, but doing so can affect others. All these examples, of course, assume that the stone's are identical in every way other than weight.Īnother thing that can affect the value of a stone is how it is cut. Or that one 50 point diamond will be worth more than double two 25 point diamonds. The price increases geometrically, which is to say that a two carat diamond will be worth more than two one carat diamonds. Rareness is a good measure of price, but the relation is not linear. Therefore, seventy-five points is the same thing as saying three quarters of a carat.Īs the carat rating of a diamond goes higher, the relative rarity of the stone increases. Carats are also divided into one hundred points. Carats are more or less equivalent to two hundred milligrams, slightly less than one quarter ounce. Actually, carat weight is how much a diamond weighs, and while there is an increase in size for an increase in weight, the carat measure does not quantify a stone's size. It is a common mistake to think that the carat weight of a diamond is its size.
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