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How to determine the value of a diamond?

The world's largest platform for trade with diamonds is the "Rapaport", the price lists which guided the vast majority of diamond merchants in the world.
Conducting transactions, be aware that the price review from the "Rapaport" gives the base value of the cost, and in addition to trade discounts, in the "Rapaport" a flexible system of discounts and surcharges to the form and quality of the cut, the dimension of the stone, the presence of accompanying documents, features luminous glow and a number of other features. Thus, the diamonds within the trading platform "Rapaport" traded like allowances to 20% and discounts up to 50% of published price lists. The biggest discounts and allowances are rare.
You also need to remember that "Rapaport" is a paid shopping site that require "subscription", so the standard discounts provided by the trading system may not apply under other conditions.
Applying price tag "Rapaport", you should consider the legal restrictions in the trade of diamonds, which in turn contributes to lower prices in some cases and increasing in others.
Using electronic calculators, provided on-line on the Internet, be aware that they operate in relation to a particular trading platform and to transactions within its borders and according to its rules. Therefore, before determining the value of diamond it is necessary to define the terms of transaction in its sales – depends on the operating type of cost and its value.