|Various forms of Pearls|
Pearls are formed inside the shell of live pearl oyster (e.g. Pinctada). They comeunder the animal group known as Mollusca. In Mollusca, there is a sub group called Bivalvia in which these animals belong.
Pearl oysters have a hard shell covering their body. This shell is made up of calcium carbonate. ln between the shell and its body there is an empty space. It is called mantle cavity.
|Pearl inside pearl oytser|
Slowly, the irritant is completely encased forming a beautiful pearl.