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To calculate the basic cost of a diamond, the Rapaport table is utilized. It is a globally recognized standard that determines the price for both round (which are more expensive) and other shapes of diamonds. Horizontal rows represent information about clarity, while vertical columns provide details about the diamond's color.
To find the diamond's price, one must locate the number at the intersection of the color and clarity characteristics and multiply it by the stone's weight. The resulting sum should then be multiplied by $100, and this becomes the base price of your diamond. The Rapaport price list is updated weekly and is presented as a price list for diamonds ranging from 0.1 carat to 10.99 carats.
For a more precise calculation of the price based on the basic cost, additional discounts or surcharges are applied:
Cutting quality below Very Good reduces the cost from the base price, while Excellent increases it.
Diamonds without fluorescence cost more than the calculated price, whereas those with strong fluorescence are cheaper.
Diamonds with transparent, light inclusions are valued higher than diamonds with inclusions of the same clarity but black in color.
Various other minor factors influence the diamond's cost: the average diameter of the stone and the ratio of its sides, the size of the diamond's table and the width of the girdle, and so on.
The Rapaport table is widely recognized in the diamond industry for its role in standardizing diamond pricing. It takes into account various factors such as cut, color, and clarity to provide a benchmark for diamond values. The weekly updates ensure that the prices remain reflective of the current market conditions, making it a reliable reference for both buyers and sellers in the diamond trade.
