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cultured pearl

or culture pearl

a pearl induced to form by placement of a grain of sand or another irritating object within the shell of a pearl oyster or mussel.
Origin of cultured pearl
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for cultured pearl

cultured pearl

a pearl induced to grow in the shell of an oyster or clam, by the insertion of a small object around which layers of nacre are deposited
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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