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Carat

In colored diamonds, as in whites, the price increases with size, or carat. However, as the size of the stones increases, the price difference between white and colored diamonds of the same clarity increases phenomenally - whites become far more expensive. While small-sized diamonds used as the raw material for color enhancement have a value only slightly lower than similar sized white diamonds, as the color differences are not easily discerned by the naked eye, the larger near-colorless stones are much cheaper because their ‘off-color’ is more clearly visible. So this price difference in raw materials is reflected at the retail level as well.