South Sea pearl-shells are common, with white edges ... If the stone be wetted with soap and water it is less liable to be clogged. The pieces are finished on the flat side of the stone, and ...

A great irony of pearl history is that the least expensive cultured pearl product in the market today rivals the quality of the most expensive natural pearls ever found. The price-value anomaly is ...

Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite entering their shell or damage to their fragile body. The oyster or mussel slowly ...

Its name comes from pearl shells having been found in the section ... It is second also to the Yangtze River in the volume of water transport, its trunk and branch rivers being navigable for ...

A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl. And you thought ... a kind of mollusk that's encased in a shell made of two valves, or hinging parts.

The shiny layer inside the shell is called the nacre, or mother of pearl. HABITAT: Freshwater mussels live on river bottoms and most require clean, flowing water to survive and reproduce. RANGE: ...