Читать книгу The Book of the Pearl. The history, art, science, and industry of the queen of gems онлайн

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It has been decided by naturalists that Ceylon oysters less than four years old produce very few marketable pearls; in the fifth, and again in the sixth year the value of the yield doubles, and in the seventh it is supposed to increase fourfold. Beyond that age there appears to be little increase, and there is the risk of the oysters dying, and of the pearls deteriorating or becoming lost. Eight years seems to be the natural limit of life. While experience has shown that the most profitable period for taking the pearl-oysters is when they are from five to seven years old, the mollusks are liable to disappear, especially after the fifth year, and the danger of waiting too long is as great as that of beginning too early. The fishing on any particular bank is determined by various circumstances and conditions, and is permitted only after careful examination.

The different beds are inspected from time to time, and no fishing is permitted until the condition of the pearl-oysters on the particular reef thrown open seems to warrant the most valuable returns. In the examination of a bed apparently in suitable condition, several thousand oysters—usually eight or ten thousand—are taken up and the pearls found therein are examined and valued. If they average Rs.25 or Rs.30 per thousand oysters, profitable results may be expected, provided there is a sufficient quantity of oysters on the bed. This method of determining the fishery is very ancient. Tavernier wrote, about 1650, “before they fish, they try whether it will turn to any account by sending seven or eight boats to bring 1000 oysters each, which they open, and if the oysters per 1000 yield five fanos or above, they then know the fishing will turn to account.”^[134] And much the same method was described by Ribeiro in 1685.