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en.wikipedia.org/wiki/Pearl

Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable. The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of ...

www.ask.com/youtube?q=How+Does+an+Oyster+Make+a+Pearl%3F&v=tIOSWAbUf74
Aug 5, 2014 ... Quick Questions gives you the low-down on how oysters turn a tiny bit of gunk into a lovely, valuable pearl. ---------- Like SciShow? Want to help support us...
www.ask.com/youtube?q=How+Does+an+Oyster+Make+a+Pearl%3F&v=0O33I5g_t-8
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www.livescience.com/32289-how-do-oysters-make-pearls.html

Nov 20, 2012 ... A natural pearl begins its life inside an oyster's shell when an intruder, such as a grain of sand or bit of floating food, slips in between one of the two shells of the oyster, a type of mollusk, and the protective layer that covers the mollusk's organs , called the mantle. In order to protect itself from irritation, the ...

animals.howstuffworks.com/marine-life/question630.htm

Most jewelry is fashioned out of precious metals and jewels that are found buried in the Earth, but pearls are found inside a living creature, an oyster. Pearls are the result of a biological process -- the oyster's way of protecting itself from foreign substances. Oysters are not the only type of mollusk that can produce pearls.

www.todayifoundout.com/index.php/2016/01/oysters-make-pearls

Jan 11, 2016 ... Kyle D. asks: Why do oysters make pearls? Pearl Oysters make pearls as a defensive response to foreign objects. The process begins when some foreign body, such as sand, a parasite or some other organic material, manages to make its way inside the oyster's shell and comes in contact with the mantle, ...

beachchairscientist.com/2008/11/12/how-does-an-oyster-make-a-pearl

Nov 12, 2008 ... Oysters are another bivalve animal. In the case of all bivalves, the part of the animal that lines the shell is known as the nacre and the part of the animal that make up the outer shell is known as the mantle. A pearl is created rather by accident when something foreign gets stuck inside the mantle, thus the ...

www.wixonjewelers.com/education/pearls/how-pearls-are-formed

In a process referred to as nucleation, highly skilled technicians carefully open live pearl oysters, and with surgical precision make an incision in the oyster's body. Then, they place a tiny piece of “mantle tissue” from another oyster into a relatively safe location. Then, they place a small round shell or nucleus, beside the ...

pearls.com/blogs/news/15236297-ten-things-you-didnt-know-about-pearls

Margaritas, Parasites and Hermaphrodites... No, it's not the aftermath of a crazy weekend, it's what youdidn't know about Pearls! 1.Your pearls probably originated in the Mississippi River... At least their core did… Cultured pearls are formed when a small sphere of mollusk shell, or “mother of pearl”, is inserted into an oyster ...