There are separate gemstones for Baromas. These are called birthstones. There are separate gemstones for twelve months. These are called birthstones. These birthmarks are based on various superstitions and myths Opal has a wonderful magical healing power. The shiny opal gemstone is the birthstone of October. Opals are also associated with cotton. On top of its beauty, opal will make the wearer more loving and affectionate in both personal and family life and will ensure the wearer a better chance and magnetize others. This delicate gemstone is a must have for those born in October.This gemstone is also known to enhance the positive traits of those born with cancer. In addition, black opal is recommended for those born under the sign of Scorpio. Boulder and fire opal are lucky stones for those under Aries.