diminishing the quantity which could be employed in any other way, may have afterwards contributed to keep up or increase their value.
The demand for the precious stones arises altogether from their beauty. They are of no use, but as ornaments; and the merit of their beauty is greatly enhanced by their scarcity, or by the difficulty and expense of getting them from the mine. Wages and profit accordingly make up, upon most occasions, almost the whole of their high price. Rent comes in but for a very small share; frequently for no share; and the most fertile mines only afford any considerable rent. When Tavernier, a jeweller, visited the diamond mines of Golconda and Visiapour, he was informed that the sovereign of the country, for whose benefit they were wrought, had ordered all of them to be shut up, except those which yielded the largest and finest stones. The others, it seems, were to the proprietor not worth the working.
As the price both of the precious metals and of the precious stones is regulated all over the world by their price at the most fertile mine in it, the rent which a mine of either can afford to its proprietor is in proportion, not to its absolute, but to what may be called its relative fertility, or to its superiority over other mines of the same kind. If new mines were discovered as much superior to those of Potosi as they were superior to those of Europe, the value of silver might be so much degraded as to render even the mines of Potosi not worth the working. Before the discovery of the Spanish West Indies, the most fertile mines in Europe may have afforded as great a rent to their proprietor as the richest mines in Peru do at present. Though the quantity of silver was much less, it might have exchanged for an equal quantity of other goods, and the proprietor’s share might have enabled him to purchase or command an equal quantity either of labour or of commodities. The value both of the produce and of the rent, the real revenue which they afforded both to the public and to the proprietor, might have been the same.