Mystical 3.91ct Contra Luz Opal. Perfect for custom ring or pendant.

Here's another one of the mystical looking Contra Luz Opals I have available at 50% off.
In normal light, it has a slight play of color but is mostly yellowish white.  Put the light behind it and see that holographic rainbow effect. This would make a perfect ring or pendant.  
The stone size is 12x9.5mm, and the weight is 3.91ct.