Nice Quality Cut/Polished Koroit Opal Cab/Gem 75.79cts Patterns/Fires Queensland Australia

I have for sale a Nice Quality and fully Polished Koroit Opal Cab from Queensland Australia. Very interesting and unique material, all from a small area in Northern Queensland. This one weighs 75.79cts and is 42x28x6.5mm,.,. Ironstone base with some very nice pattern/colour through both sides. The Blue/Green is in both sides and interesting pattern and Potch colours both sides of that.. Nice Large Collectors stone, double sided ready for a collection, or Set it as a huge pendant piece,.,. Thanks for looking,.,.