Who should wear Opal? Opal is highly recommended to someone, who has Mahadasha or Antardasha of Venus (Shukra) in the horoscope. Indian astrology assigns Opal Ratna for Tula (Libra) and Vrishabha (Taurus) Rashi. Western astrology recommends opal birthstone for Libra sign. Opal is thought to cure eye-related problems and keep eyes healthy and grant an excellent immune system. It is considered to enhance the creativity and artistic abilities of a person. Opal is believed to bring good fortune, peace, joy, and wealth to the wearer. Opal helps the wearer to have a pleasing personality.