The Pearl, its story, its charm, and its value

by Wallis Richard Cattelle

The fish-scale solution used is a guanine, the mucus which lubricates the scales of the bleak fish (alburnus lucidus). The white scales of the fish are carefully scraped into a horse-hair sieve over a shallow tub of fresh water. The first water is thrown away. The scales are then washed and pressed. The mucus sinks to the bottom and is gathered as an oily mass, very brilliant and bluish-white. This is packed with ammonia in tin boxes and sealed for shipment. It takes about 20,000 fish to make one pound of the mucus.

A cheap imitation pearl is made of opal glass, a bluish-white milky appearing material, to which a pearly effect is given by treating it with fluoric acid. Imitation black pearls are made from hematite, but as they require careful finishing to hide the metallic luster and are much heavier than pearls, they are seldom used.

The Chinese and Japanese have been much more ingenious in their methods and have long produced, with enforced aid from the animal, imitations which are in part real pearl. The former insert in the Chinese pearl-mussel (anodonta herculea) small figures of Buddha upon which the fish proceeds to deposit its nacre. When they are coated, which occurs in from one to two or three years, the pearly figures are extracted and sold to the devout.

The Japanese do more. They attempt to produce a marketable gem and have so far succeeded that a considerable number have been sold of late in the United States and in many cases the public buy them not knowing that they are an artificial production. The base upon which the nacre is deposited appears to be composed of a substance resembling porcelain shaped like a low dome hollowed out on the under side and having a hole in the centre of the cavity.

As there is no nacre on the under side, it must, when the button is placed in the mussel, be thereby protected from the action of the fish except at the edges where the nacreous deposit probably joins it to the shell but in such a manner that it can be easily detached. The pearl covered button is then fitted to a piece of polished mother-of-pearl of the same exterior size and shape and the two are neatly joined, forming a double low domed piece of pearl on one side, and mother-of-pearl on the other. These Japanese pearls as they are called, when mounted in a setting constructed to hide the under side, have the appearance of imperfect spheres of natural pearl.

The beds where the culture of these artificial pearls is carried on, are situated in the Bay of Ago, a few miles south of the Temple of Ise, in central Japan on the Pacific side. It is a quiet piece of water, in a coast broken by numerous inlets and coves. A little north of the centre of the bay is a small island called Tadoko where the necessary buildings and the men connected with the industry are. Around the island and near it, about 1,000 acres of sea bottom are leased and used for the pearl oyster cultivation. The water is about five to seven fathoms deep.

The oyster used is the one common to the waters of Japan, the Avicula martensii Dunker. In May and June, stones weighing six to eight pounds are scattered over the bottom of the sheltered shallows which run up into the land, where the spat is collected. The breeding season is in July to August and in the latter month very tiny shells attached to the stones by the byssus may be seen already.

The number increases as the season advances until in November, in order to protect the young fish from the approaching winter cold, the stones lying in very shallow water are removed with the adhering oysters to deeper water—over six feet. After three years the oysters are taken out and the nuclei of the culture pearl inserted. This done, they are spread over the sea bottom, about one to every square foot and left undisturbed for four years. They are then taken out and opened and both the culture pearls and whatever natural pearls there may be, are harvested. At present, upwards of a quarter of a million oysters are treated annually.

Experiments are being made constantly, in the United States and Europe, to improve upon the hollow glass bead lined with fish-scale but so far without success. The finest of these imitate the natural pearl very well and if finely mounted similar to the genuine, will deceive many while worn. Closer observation will reveal the glassy shine of the surface and it will be found under the loup to contain numerous small holes. The specific gravity is also less.