Opal is the birthstone of October. There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence), common opal does not.Play-of-color is defined as “a pseudo chromatic optical effect resulting in flashes of coloured light.” Black opal is considered to be the rarest, whereas white, grey, and green are the most common.
Healing properties on Opal includes, sparking creativity, renews hope and gives balance to its wearer. It also serves as a good luck charm to attract amazing things to life. Along with boosting immunity, it also helps in treating infections and fever.