This is a shaped and polished tear-drop, ready to mount or display, natural Welo opal from the mines of Ethiopia.
It is high domed, approx. 13mm by 8mm, 3mm thick and of 2.05 carats.
This opal has a pale grey background colour, with bright rolling flashes of green, yellow, red, blue and orange radiating from within the crystal itself and across its surface as turned in the light.
A beautiful unique stone, which would make an unusual ring, pendant or simply kept as a mineral sample.