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en.wikipedia.org/wiki/Pearl

A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living ... Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those .... When a cultured pearl with a bead nucleus is X- rayed, it reveals a different structure to that of a natural pearl (see diagram).

en.wikipedia.org/wiki/Oyster

Pearl oysters are not closely related to true oysters, being members of a distinct family, the feathered oysters (Pteriidae).

www.encyclopedia.com/plants-and-animals/animals/zoology-invertebrates/pearl-oyster

Get information, facts, and pictures about Pearl (oyster) at Encyclopedia.com. Make research projects and school reports about Pearl (oyster) easy with credible ...

www.amnh.org/content/download/39657/579788/file/pearlsguide.pdf

Display a diagram of a pearl oyster or draw a simplified diagram on the chalkboard. Students should learn that pearls form within oysters and certain other ...

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 ...

www.nationalgeographic.com/animals/invertebrates/group/oysters

Learn why these slimy-but-tasty invertebrates produce pearls. See how oysters can help humans monitor water quality by serving as “canaries in the coal mine."

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 ...

www.pearls.co.uk/pages/types-of-pearl

NATURAL SEAWATER PEARLS or OYSTER PEARLS .... The following diagram gives an idea of the success rate of oyster pearl cultivation, Out of 1000 cultured ...

www.pinterest.com/pin/571886852651409586

Pearl farming #1: It takes 2-4 years to harvest pearls. Oysters are placed in baskets to protect them from predators and every month the oysters are cleaned of ...