Nice Large 516cts Rough/Sliced Koroit Opal Specimen Slab Queensland Au Fires/Patterns

I have for sale a Nice Chunk of Rough and sliced Koroit Opal from Queensland Australia. This one weighs 516cts and is 87x47x21mm.,,. It a Mix of Red/Brown and Light Base Ironstones, with a Bar of Pattern/Fires through the middle. A couple of pits, but mostly Solid material. This should wrap around inside, unsure of How deep the colour will go. Superb Large Specimen piece for a collector, with every colour/Ironstone type accounted for. And should cut some Cabs/Freeforms, if that is the plan..  Thanks for looking,.,..