The internal structure of opal makes it diffract light; depending on the conditions in which it formed, it can take on many colors. 

Colors:  ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black.

Metaphysical:  Opal is an emotional stone and reflects the mood of the wearer.  It intensifies emotions and releases inhibitions. Encourages both freedom and independence. Opal stimulates originality and creativity. Helps to release anger and claim self-worth, aiding in accessing and expressing one’s true self. 

Astrological sign: Cancer, Libra, Scorpio, Pisces