The pearl gemstone, also known as a moti is the only precious object that is not produced as a mineral from the crust of the earth but grow organically inside a living organism. The pearls grow inside the body of a mollusk .When some external elements enter its shell and functions as an irritant. In order to prevent it from disturbing the main body of the mollusk, the organism covers it with layers of calcium carbonate which eventually leads to the creation of a pearl.