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How to Calculate Diamond Prices

Historical

Martin Rapaport

Martin Rapaport learned the business of rough diamonds in Antwerp (Belgium), he is a graduate GIA. He began his career in the industry as a broker of rough and polished diamond in New York in 1975. He established, in 1978, the Rapaport Diamond Price List (called by the professionals Rap or the List), which has become the primary source of diamond prices and market information for the diamond trade. Over the years, this price lists became Rapaport Diamond Report and it is in 1982 that he established RapNet, an online interactive diamond trading market, that has been expanded to include Diamonds.net. Martin Rapaport is a member of World Diamond Council and he played an important part in Kimberley Process: certification for the international trade in rough diamonds.

He is more powerful than De Beers yet he handles this power without any sign of corruption.

Rapaport Diamond Report

Rapaport Diamond Report

Rapaport Diamond Report is composed of sheets of price lists (see the example on the left and below). These price lists are accessible only by subscription, for the professionals.

The color of these sheets is always red in order to avoid and to limit photocopies or faxes which become black.

There are various lists according to the weight (from 0 to 11 carats) and the shape. Price rises are printed bold (example below: G-VVS2 to G-VS2) and falls are in bold italics (example below: E-SI2 to E-I1).

Because cut/shape, fluorescence, symmetry and polish are not included on the list there can be an important variations in price.


RAPAPORT : (1.00 -- 1.49 CT)      03/05/04     ROUNDS
  IF VVS1 VVS2 VS1 VS2 SI1 SI2 SI3 I1 I2 I3
D 280 255 240 220 210 195 185 175 160 140 120
E 250 245 235 225 215 190 180 170 155 135 115
F 230 220 210 200 180 165 150 135 120 110 100
G 210 200 190 180 170 155 140 120 110 100 90
H 195 180 170 160 150 135 125 115 100 90 75
I 180 160 150 140 130 120 110 95 80 75 65
J 160 150 135 125 115 100 90 80 65 55 45
K 140 130 120 110 100 90 80 70 60 50 40
L 130 120 110 100 90 80 70 60 50 40 30
M 120 110 100 90 80 70 60 50 40 30 20

All diamond prices being reproduced on the list above are false, they do not reflect the reality and are there only for examples.

How to calculate diamond prices

The diamond prices indicated on these lists are expressed per carat, in hundredth of American dollar ($100's per carat).

On the first line of the list, one finds the weight, the date and the cut.

On the second line, one finds the clarity grade from IF to I3.

In the first column, one finds the color grade from D to M.

Therefore all you have to do is to move horizontally and vertically according to the color and the clarity to know its price in dollar per carat.

Example:

Diamond price of 1.00 carat G-VVS2 Round cut is 190 in our list. Its price would be thus 1.00 carat x 190 x 100 = $19,000.00.

Diamond price of 1.36 carat E-VS2 Round cut is 215 in our list. Its price would be thus 1.36 carat x 215 x 100 = $29,240.00.

We repeat that these diamond prices are not real. It is only an example.

If you wish to know the diamond prices in the retail trade, click on this link: Diamond Prices.

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