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The value of diamonds, is determined by the 4 C's as everybody knows. On regular basis a list of values are published by different business partners in the sector. The Rapaport list is the best known value list in the sector. This list gives an indication what the value of (rough or cut diamond) is worth it, by taking into consideration different C's.

Although the value of diamonds, contrary to the popular opinion, does not increase in direct proposition to the size, or rather the weight of the stone. An old rule, still in use makes the value increase in proposition to the square of the weight. According to this rule a diamond weighting two carats would be worth four times and not twice the value of one carat stone of the same quality. In the same way a three carat diamond would have a value of nine times that of a one carat standard. This rule held, in general, while relatively low values of small stones prevailed, and many of the sales of famous diamonds that were recorded fifty or one hundred years ago were made on this basis. With the growing demand of diamonds weighting from one to five carats, however, the standard of the value for a one carat brilliant cut gemstone has vastly increased and with this increase has come a very material modification of the estimation of values.

Last but not least, the 4th C -the cut- is often under-estimated. No matter which shape (pear, emerald, round or brilliant shape…) is chosen for a diamond, the quality of cutting is very important. This because it could influence the brilliance of the diamond. In other words, how nicely has the cutter shaped the diamond? The reasons why Antwerp has -since centuries- an excellent reputation in cutting, is because the Antwerp cutters are real specialists!


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