How Do Oysters Make Pearls?

Over 4000 years ago, a Chinese man was hungry sosomething in an oyster's body while at the same time
he decided to open some shells and feed himself. Hethey have to be so careful not to harm the oyster.
became the first man to ever find a pearl!The largest ever was 5 centimetres long, with a
In the past, pearls could be found in many parts of thecircumference of 10 centimeters. They can be valuable
world. Today, they are mostly in Bahrain and there areif found in the wild, but because they are very rare the
some reports of natural pearls from the Australianmajority of pearls are cultivated or farmed (made
Indian Ocean.from pearl oysters). Pearls from the sea are more
Pearls are made of calcium carbonate and cochiolin. Itexpensive than those from freshwater. Of course,
is considered that a foreign body in the shell eventuallythere are fake ones too that are not very expensive
becomes the pearl. For example, if a grain of sandat all.
enters the shell, the mollusk, irritated by the intruder,During the development of cultured pearl oysters,
starts to coat the irritation with calcium carbonate andsome species start to make pearls in colour (they can
conchiolin. Eventually, that grain of sand will becomebe pink, ream, silk or gold) However, the most
the pearl.interesting is the black pearl. The oysters that produce
When nature does everything by itself a pearl can bethese are from the species Pinctada margaritifera.
shaped perfectly round. There are eight basic shapes.They are called "black Tahitian pearls", since they are
They can be round, semi-round, button, tear, pear,farmed in Tahiti.
baroque and circled. Of course, the perfectly roundedIn the past, pearl hunting was the only way to harvest
are very rare and due to this, the most expensive.pearls. Divers would dive the ocean bottom or river
Man has found a way to produce pearls, but they arebed and collect them. They had to check each pearl
never as beautiful as those from the wild.individually, because not every oyster has a pearl in it.
In Japan they found a way to produce perfect pearls.In fact, from three tons of pearls, only three or four will
It is almost like surgical intervention. They injecthave pearls.