How do oysters make pearls?

                          Oyster and Pearl

               

Oysters belong to a class of mollusca called

bivalvia because of their hinged  double shells

or valves. Oysters have a soft and a sensitive

body inside their hinged shells.When a grain of

sand  or grit gets inside the shell of an oyster

and reaches the soft body,It starts covering The

Grain with layers of a hard smooth substance

called nacre.

                

               This is done to reduce the irritation caused by the grain  to the sensitive body of the

oyster.A beautiful white silky round pearl is formed when many layers of this substance are produced by it.

To get more pearls, people deliberately putting a grain of sand or a small bead inside the oyster.The idea succeeded, and more and more pearls could be produced by using this method.These are called cultured pearls and same as natural pearls.,the only difference being that a process of producing pearls is artificial or deliberately induced.

            The main ingredient of the nacre  which

makes pearls is aragonite, a calcium

carbonate distinguished by its orthorhombic

crystalline system, with the type of mollusk

and its environment. Colours  can be found in

ranges from black to White, as well as cream,

Grey, blue, yellow, lavender, green and mauve.