How to grow pearls?
How pearls form
The secret of the appearance of spherical pearl inclusions inside the clam shell is simple: a grit, splinter, parasite larva, pebble or other small particle that the clam recognizes as a foreign body enters through the slightly open shutters. To neutralize the newcomer, he uses nacre, evenly covering this irritant with a hardening substance.
Growing pearls at home is impossible. Growth requires immersion in the sea, the water of which is rich in trace elements necessary for the healthy functioning of the mollusk.
For the formation of a round pearl body takes months and even years. Due to the immobility of the mollusk, pearls are often uneven.
Methods of growing pearls
Thanks to human observation, the principle of growing pearls was discovered in ancient times.Over the years, inventive personalities added interesting nuances to the traditional solution, but the essence remained the same: a foreign body is placed inside the shell of the mollusc, around which it forms a mother-of-pearl shell.
The first to grow cultured pearls began to Chinese. In the 13th century, they invented a simple procedure:
- The shell of a young mollusk is opened with thin tongs.
- Inside, between the folds of the clam mantle, with a bamboo stick lay a grain of sand and close the sash.
- The finished shell is placed in a special pen in the sea and wait a couple of years.
China - the leader in the production of pearls. Farmers grow crops in fresh water. Chinese pearls are rarely used for jewelry: it is crushed into powder, which is added to cosmetic and medical products.
In the 18th century, the Chinese procedure was perfected and supplemented by the naturalist Linnaeus, who subsequently grew many valuable specimens.
For a long time the scientist did not succeed in creating a round pearl, and then he invented a solution: he made a hole in the upper shell of the shell with a thin drill and lowered the wire with a limestone ball into it.at the end.
As it grew, it was supposed to twist and move the ball so that the nacre was superimposed evenly. Due to the troublesome way invented by Linnaeus, he did not make an impression and was soon forgotten.
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In the 19th century in Japan, the cultivation of pearls took an industrial scale.
To speed up and simplify the procedure, the Japanese attached a ready-made small pearl ball to the mother-of-pearl leaf, and then lowered the shell into the sea water together with the rest, placing them in special wooden structures designed to protect the mollusks from predators.
Japanese pearls have a flat surface on the side where it was attached to the mother-of-pearl layer, so when pearls are applied to the flat side, pearls are attached to the flat side. This feature is a distinctive feature of cultured Japanese pearls.
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