This is a shaped and polished freeform, ready to mount or display, natural Coober Pedy banded opal from the mines of Australia.
It is domed on both sides, approx. 17mm by 10mm, 3.5mm thick and of 3.75 carats.
This opal has a pale grey background colour with a plain grey band in the center with areas which flash green, yellow and orange at either end of the stone.
A unique stone, which would make an unusual ring, pendant or simply kept as a mineral sample.