MAIN TYPES OF #OPAL
Crystal / Water Opal
Transparent to semi-transparent, with a clear background. Vivid and strong play-of-color
White / Light Opal
Translucent to semi-translucent, with play-of-color against a white body-color.
Black / Dark Opal
Translucent to opaque, with play-of-color against a black or dark grey background.
Fire Opal / Mexican Opal
Transparent to translucent, with red, orange, yellow, or brown body-color. May or may not show play-of-color.
Translucent to opaque, with play-of-color against a light to dark background and rock matrix.