A seashell with a pearl is a symbol of beauty and elegance. The pearl that is formed in the mussel is a result of the mussel s defensive response to foreign objects entering its interior. The mussel then forms a layer of nacre around the foreign body to insulate it. Over time a smooth round pearl is formed. Pearls have been a coveted piece of jewelry for centuries and have been viewed by many cultures as a symbol of wealth and power. Nowadays pearls are often used as jewelry but they are also used in the cosmetics industry and in the manufacture of art objects.