Other types of imperfections actually increase the value of a stone. In a cat's eye stone, the band of light gives the impression of the vertical opening of a cat's iris. Many designs are resurrected time and time again. So while a piece may look vintage, it could, in fact, have been very recently made. It is important to understand the distinction between vintage and contemporary jewelry, although each has its own appeal.
Estate jewelry is another important category.
You should always check the guaranteed portion of a piece's description for mention of the manufacturer. By closely examining a piece, you should be able to determine the quality of its workmanship. Also, be sure to examine areas where two pieces of metal are attached to see if the joint was smoothly finished and polished. Pearls have been prized for their beauty in nearly all of the world's civilizations. If a diamond has a certificate, it is easy to determine if the stone has any internal or external imperfections.