This is a shaped and polished pear-shaped, ready to mount or display, natural Welo opal from the mines of Ethiopia.
It is polished on one side, high domed, 16mm by 11mm at its widest points, 7mm thick and of 6.30 carats. There is a small patch of sand/potch on the reverse, but this does not impact on the front surface and, if anything, confirms it to be a natural opal.
This opal has a pale grey background colour, with bright pin-fire flashes of pink, green, yellow and blue 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.