[DOC] [TLE] Pearl - Wikipedia [PAR] 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 .... These freshwater pearl mussels occur not only in hotter climates, but 
also in ... Typical stimuli include organic material, parasites, or even damage that
... [DOC] [TLE] Bivalvia - Wikipedia [PAR] Pearl oysters (the common name of two very different families in salt water and 
fresh water) are the most common source of natural pearls. The shells of bivalves
... [DOC] [TLE] Pearls and other organic gems [PAR] The typical irridescence of the pearl is due to the series of nacre layers. ... thus 
only pearls from mollusks with a nacreous mother of pearl lining are "true" pearls 
... Some examples of pearl-producing oysters (you don't have to remember these) 
are: ... Probably the most common freshwater pearl on the market is the Chinese
... [DOC] [TLE] Pearl-Producing Mollusks (Molluscs) - Pearl-Guide.com [PAR] Pearl-Producing Mollusks (Pearl-Producing Oysters) Mollusks represent one of 
the world's ... can produce pearl-like formations, most of them are not pearl 
producing mollusks. ... Pearl Guide - World's largest pearl information source ... of 
bivalve mollusks, only relatively few of these species are used in pearl culturing 
to... [DOC] [TLE] Pearl - New World Encyclopedia [PAR] A pearl is a hard, smooth, rounded (not necessarily round), lustrous object ... In 
these mollusks, nacre is continually deposited onto the inner surface of the ... 
Chief sources of nacre are the pearl oyster, freshwater pearl mussels, and the 
abalone. ... Typical stimuli include organic material, parasites, small crabs, food 
particles... [DOC] [TLE] Does Every Oyster Have a Pearl? | Wonderopolis [PAR] Most pearls are made by oysters, and they can be made in either freshwater or ... 
Other common pearl colors include gray, red, blue, green and even black. ... 
These people open oysters, cut small slits in the mantle and insert small irritants 
... Cultured pearls are often less expensive, though, because they're not as rare. [DOC] [TLE] The Basic Methods of Pearl Farming - Center for Tropical and ... [PAR] Pearl oysters are most commonly found in remote tropical atolls where ... Pearl 
oysters are members of the phylum Mollusca and belong to the class Bivalvia. ..... 
It is not possible to calculate exactly how much these 1,350 pearls will be worth, 
since .... locate your farm near the mouth of a river or other sources of freshwater
... [DOC] [TLE] About Pearls - - Ramina Rechard Pearls [PAR] Pearls are formed within oysters or mollusks when a foreign substance (most 
often a parasite  not a grain of sand) invades the shell of the mollusk and enters 
the ... Originally these pearls were marketed as a lower quality, inexpensive ... 
The most common shape in freshwater pearls is oval or button shaped (sixty 
percent). [DOC] [TLE] pearlBritannica Student Article - ebi - EnWiki [PAR] These mollusks line the inside of their shells with a substance called nacre. ... 
Most mollusks are capable of producing pearls, but the common sources of ... 
oysters, which produce saltwater pearls, and mussels, which produce freshwater 
pearls. ... No one knows exactly how pearls develop their color, since one oyster 
may... [DOC] [TLE] Pearls - Braybrook & Britten [PAR] Hydrated organic gemstones - pearls sounds nicer - are commonly produced by 
bivalve molluscs, especially Pearl oysters and some species of freshwater 
mussels. .... Unlike cultured saltwater pearls, freshwater pearls are not bead-
nucleated and ... These two species of thin-shelled oysters are the most common 
sources of... [DOC] [TLE] Freshwater Pearl [PAR] Cultured pearls are those which form in certain mollusks (oysters and ... This 
operation must be done skillfully so that the creature not only survives but ... 
Primary sources of production of freshwater cultured pearls are China, Japan, 
and the US. ... and saltwater cultured pearls was relatively common in these little 
beauties. [DOC] [TLE] How cultured pearl is made - history,

Question: These mollusks, not oysters, are the most common source for freshwater pearls
Answer: Mussels