A natural pearl, also known as a “moti” in some languages, is a rare and valuable gemstone that forms inside the soft tissue of a living mollusk, such as an oyster or clam. It is created when a foreign object, such as a piece of sand or a parasite, enters the mollusk’s body and irritates its soft tissue. In response, the mollusk secretes a substance called nacre around the irritant, layer by layer, until a pearl is formed.

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