Pearls themselves are very unique. They are the only "gemstone" that is created by a living creature rather than by chemicals and pressure. For centuries they have been referred to as a gemstone by jewelry retailers. But they are not a gemstone at all. They are created when a mollusk (usually an oyster) gets a grain of sand inside of it's shell. This is an irritant to the mollusk and so the shell starts to grow around the sand in order to protect the resident oyster. A pearl is formed. Pearl Necklaces a so unique because you never find two that are identical. Pearl necklaces contain many pearls and each pearl all though it may be simliar in size, shape and color, it is very different. This has created much ado about pearl necklaces.
