Black opal with sharp point: approx 30mm x 14mm x 9mm deep at thickest edge. Bright iridescent green rolls over the N3 potch edge on one side giving incredible 5 - 10mm solid colour edge.
Black crystal opal rough rectangle shape: approx 27mm x 12mm x 7mm thick. Bright green/blue colour bar runs through entire opal save for a bit of black potch along one side.
These rubs suit carving to maximise yield.