Junior Science Refresher this is science magazine in india published this article page no 37 pearls are produced by mollusks mussels or oysters belonging to the unionidae family. saltwater pearls are produced by oysters in the ocean while freshwater pearls come from mussels growing in lakes rivers or ponds other than the ocean. these mollusks create a substance called nacre when an irritant object enters its shell. the nacre will wrap around the object until it is covered with this iridescent substance and the resulting gem is known today as a pearl. maybe you have heard of the term natural pearls and cultured pearls. natural pearls are created without human intervention while cultured pearls are produced by a process where man will introduce a foreign object inside the mollusks shell and harvests it after nacre coating. due to over fishing the pearls produced the natural way are very rare junior science refresher magazine buy.
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