Valuation of colourless diamonds

The valuation of colourless diamonds is based on the wholesale Rapaport Diamond Price List. The largest diamond trading companies send in a report on their transaction pricing once a week. Rapaport collects and aggregates them. The result is presented every Thursday at midnight. On its basis, you can estimate the value of a diamond and start negotiating a commercial transaction.

Rapaport Diamond Price List

The price list is commonly used by diamond market participants to estimate the price. Prices quoted in the report may be significantly higher than the actual transaction prices. In the diamond trade, the most commonly concluded transactions are with a discount in relation to the prices from the Rapaport Diamond Price List. Also, diamonds that are in strong demand or have unique characteristics can be sold at a significant premium to the listed prices. This most often regards large, very well-cut diamonds.

The size of the rebates or premiums relative to the roster depends on many factors such as stone quality and cut, credit conditions in a given market, specifications and liquidity of a given market. Stones that are more difficult to sell will have a greater discount than those that are in demand. The Report itself is not a price list in the strict sense, but is an aid to estimate the value of a particular colourless diamond and serves as a starting point for price negotiations.

The Rapaport Diamond Price List refers to Round (brilliant) and Pearl (pear) shaped diamonds in the Rapaport A3 and higher specification.

A3 diamonds have, among others, the following features: 

How to read the Rapaport Price List? 

The values given in the report are expressed in hundreds. The value of 5.5 should be read as 550 USD, 150 as 15,000 USD, etc. If the price of the diamond has increased, it will appear in bold type in the Report.

There are many tables in the Report. Each one is for a specific weight of a diamond. At the top of the table, horizontally, there is a diamond clarity scale, and on the left, vertically, a colourless diamond colour scale.

5 steps are enough to find the price of each colourless diamond:

1. Finding a table with the correct weight.

2. Finding the stone according to appropriate clarity (search vertically).

3. Search the lines (horizontally) with the appropriate colour.

4. There is a price at the intersection of the column and the row.

ATTENTION! The prices are given for 1ct. To calculate the price of a diamond, the result from the Report should be multiplied by its mass.

5. We multiply the price from the table by the mass of our stone.2. Finding the stone according to appropriate clarity (search vertically).

Example:

We are looking for the price of a Round shaped diamond brilliant diamond weighing 0.71 ct, of VS1 clarity and E colour.

Graph 1. Rapaport diamond report

Source: Rapaport

1. We are looking for a suitable table with the weight. In our example, it is between 0.70 and 0.89 ct.

2. Then we look vertically for clarity. VS1 is in the 4th column from the left.

3. The colour E is shown in the second line from the top.

4. The price at the intersection of the 4th column from the left (VS1) and the second row from the top (E) is 56, so the price for 1 ct. is $ 5,600.

5. $ 5,600 x 0.71 ct. = $ 3,976.

Rapnet - informs about an average transaction price on the colourless diamond market

At the beginning, we mentioned that the prices in the Rapaport Price List are not market prices and are only a guide in order to start negotiations. A good supplement to this price list is to check the prices in the Rapnet database, which monitors the average and best prices on the market. Depending on the diamond's clarity and colour, it can be sold at a 20-40% discount or at the same or higher premium. Most often, diamonds are sold at prices below the Rapaport Price List. Diamonds above 2 carats, regardless of colour, but with a clarity of I1 and I2 class, are most often sold at a premium.

The Rapaport Price List is not a price list in the literal sense, but is used to help you estimate the price of a specific colourless diamond. 

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