Folks this is a beautiful Crystal Opal from Andamooka and was cut from Andamooka Concrete, the hardest material there is.
It has been professionally cut and polished and measures 20 x 14 x 4mm.
As you can see it is full of reds, greens, blues, and has just about every color there is. I really llike the fash of sky blue, as you dont see a lot of that.
There are many color patterns in this Opal. Overall it has a striated pattern, but broad flash as well, with rolling flash. I really love the way the reds run across the face, in a 3D effect. This Opal really does have color on color.
Indoors it is red/green, but as soon as the light hits it, its goes crazy with color.
You could set it as a ring, but as it is not common to have Opals that look as good as this one when hung vertically, I would make it into a pendant.