In 1750, the price of the stone in Europe was $40 for one-karat gems. This was just before the discovery of the Brazilian mines. The sudden influx of the gems reduced the price shortly after to $5 per karat; but the market soon recovered from the panic, and in 1791, at the time the inventory of the French jewels was made, the price had arisen to $30 for the same class of diamonds. Since this period, the prices have varied, from the influences of the wars of Europe, sinking at the time of the disturbances of the Revolution of 1848, to $20 and $25 per karat. But after the year 1850, the price of the gem steadily advanced, and in 1865, its quotations were almost the same as that of Venice in 1606. This comparison, however, should not be made without remembering the vast difference in the value of money of the two periods.
The valuations of the diamond for more than a century past have been based upon the form of the brilliant, while those of the star, table, rose, and others, have been valued at lesser and sometimes almost nominal prices.
The price of the rose diamonds has been affected by the views of fashion for a long time, and at the present day we are unable to establish any fixed scale. We will, however, append the views of some of the gem experts as to the valuation of this pattern, during the past two centuries.
Robert de Berquen, in 1669, valued the rose cut
| of 1 karat at 100 francs. |
| ” 2 ” ” 500 ” |
| ” 4 ” ” 1,500 ” |
| ” 8 ” ” 6,000 ” |
| ” 10 ” ” 9,000 ” |
This estimate, however, was not founded upon any principle; and it was not until the celebrated Tavernier formed his rule for the valuation of the rose cut, that the diamond had any definite value. Tavernier, in 1692, took for an example a rose of one karat, of fine water, white, and of good form, and fixed the valuation at 150 francs, and for gems of greater weight multiplied this figure by the square of their weight. The justly celebrated jeweller and traveller also followed the same rule with fine diamonds that were not of regular form. The brilliant cut was not then known.
In 1858, in France, the comparative values were: for one karat, fine brilliant cut, 300 francs; for one karat, fine rose cut, 200 francs.
The following list has been kindly furnished me by Henry D. Morse, Esq., of Boston, as giving the value of diamonds in the United States at the present time, January, 1884. The prices have fluctuated considerably during the past year, and the estimates given are wholesale prices, and regarded as being quite low for fine stones:—
| Lots averaging ¹⁄₂ karat each, $60 per karat. |
| ” ” ³⁄₄ ” ” 80 ” ” |
| ” ” 1 ” ” 100 ” ” |
| ” ” 1¹⁄₄ ” ” 110 ” ” |
| ” ” 1¹⁄₂ ” ” 125 ” ” |
| ” ” 1³⁄₄ ” ” 145 ” ” |
| ” ” 2 ” ” 175 ” ” |
Above two karats the prices are not much increased per karat, because of their not being as much in demand. Stones of five karats and upwards, being very slow to sell, at the present time can be bought at $175 to $200 per karat, of the same qualities as the two-karat stones quoted above. Very extra white perfect stones, when well cut, bring, when sold singly or few at a time, from 20 to 25 per cent more than the prices quoted. The lower grades of stones are generally sold in lots, and the sizes do not make much difference in price. The larger they are the less desirable, and oftentimes stones of from five to ten karats are sold cheaper than stones of one to two karats; the price depending upon the shade of color and skill in cutting. Lots of this description can be bought for from $75 to $90 per karat. If the tinge is a little more decided they will bring but $60 per karat. The yellow diamonds even ranging as high as ten to twenty karats bring about $45 per karat. Flawy stones bring from $15 to $35 per karat, according to their color, size, and brilliancy. Fine rough stones of assorted sizes, varying from three to ten karats, bring from $30 to $45 per karat according to their shape and perfection. Smaller sizes are reckoned in value from $15 to $20 per karat. Cheaper grades and off-colored crystals are sold as low as $8 to $12 per karat. The bort diamonds vary in value; those coming from Africa bring but $1.50 per karat, while the same variety found in Brazil bring $6. The carbon variety of the best sizes bring about $20 per karat. Fifteen years ago the same mineral could be bought for $2.50 per karat; while the Brazilian bort was quoted at $9.