Generally black pearls are considered the most valuable. Pearl color and luster formation is a wonderful mystery of nature. There are many theories and explanations, but we believe no one knows for sure. Real pearls are made by nature, not by people. Simulated pearls can be perfectly round and unblemished.
Every pearl is unique and natural.
Only a small fraction of pearls are perfectly round. While the perfect rounds are the most valued, pearls of other shapes are still considered quite beautiful and valuable, provided that the luster is good and there are minimal flaws. Keishi and mabes are also used in jewelry. They are often used to accent cultured pearls. Some pearl farmers graft special nuclei to the actual shell of the oyster.