The pearl is the only precious stone quarried from the land. Then how is the pearl? It occurs in the shells of mollusks. This happens when the sink penetrate foreign particles. This can be sand, small inhabitants of the fauna, and so on. All of these can injure the body of the mollusk. To avoid this, it begins to secrete a special substance. It is called nacre and is translated as mother of pearl. This material coats the foreign body, smoothing out all the sharp corners. And formed pearls. The longer it is inside the shell, the larger it will be, because the substance of the clam layers envelops it, and it is released until the pearl leaves his home. This can happen when the diver gets it. After that, the gem is delivered to jewelers. From pearls they create jewelry and even the photo you can appreciate their beauty. Such products are quickly sold out and not only because of their splendor, but also because they have healing and magical properties.