Opal Austria The piece features not one

The piece features not one

to help retain its color

which is part of the reason they are so desirable among collectors

but to find non-pseudomorphic

or dendritic

Opal Austria The piece features not oneThis "Round Cabochon" cut gem has a beautiful colorless interior in transmitted light, but in reflected light it shows the highly desirable and seldom seen COLOR FLASH or "Contra Luz" effect with a beautiful rainbow like array of color! The color flash is best seen in sunlight or with a strong flashlight against a black background, and this stone was photographed under a strong light to better illustrate the effect. When strongly lit, this stone shows