Pearl is the most precious of every natural gemstone; they are made when an oyster detects an aggravation inside its delicate shelled mouth and after that coats it with layers of nacre. Today, all pearls available are refined by misleadingly presenting a small bead or shell into the mouth of a oyster. Most of the pearls are refined in Japan, yet numerous are harvested in China and the South Pacific. Pearls rang in different sizes, shapes and colors: some are big, round and white while others are little, shapeless, and black. Pearls have always been viewed as classic gemstones, which symbolizes excellence and nobility. The pearl is the zodiac gemstone for Cancer.