Pearls are harvested from __________.

The correct answer is Oyster.

• Pearl is a glittering object produced within the soft tissue of marine oysters and freshwater mussels.

Key Points

• It is formed against the natural defence system which is an irritant such as a parasite that tries to enter their shell or damage their soft body.
• A natural pearl begins its life inside an oyster's shell when an intruder, such as a grain of sand or a bit of floating food, slips in between one of the two shells of the oyster, a type of mollusk, and the protective layer that covers the mollusk's organs, called the mantle.
• Cultured pearls are made in the same way. The only difference is that instead of accidental circumstances, a "pearl farmer" embeds a grain of sand into the mollusk.
• Aragonite and conchiolin make up their cell and are slowly secreted in layers in oysters and mussels.
• This creates a material called nacre or mother of Pearls which encompasses this irritant and protects the organism from it.
• The more and thinner the layers in the pearl are the better it is.
• The unique properties of a pearl depend on refraction,  reflection, and diffraction of light from its layers.