Opal symbolizes optimism, amplitude, and purity. This stone is essentially an October birthstone jewelry and has a strong ties to persons born under the sign of Libra or Scorpio.  If you were born under the sign of Libra, the autumnal equinox, which marks the height of harvest and the point at which day and night are in balance, coincided with your birth. Opal and eroticism have long been associated. It is a lovely stone that enhances peace and calm and releases restraint.