Mother of Pearl
Mother of Pearl or Nacre is created by mollusks to protect their soft interior tissue. The difference between these and pearls is placement, with the former being formed on the inner linings of a shell.
A pearl, on the other hand, is created when a foreign object enters the shell. The mollusk will then encase the foreign object in order to protect itself. The material used to create the encasement is the same nacre.
The end result of this foreign object being encased in nacre is a round-shaped pearl. However, mother of pearl takes the shape of the shell that it lines.
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