Nice Quality Rough Koroit Opal Preform 191cts Blue/Green Fires/Nut/Pattern Qld Australia

I have for sale a Nice Quality rubbed/preformed Koroit Opal Nut from Queensland Australia. This one weighs 191cts and is 54x29x13mm. ironstone base material with lots of Green/BLue Fires and pattern over the top, some sides and most of the back. There is a piity nut core at one end in the back. Will finish up a nice large freeform cab, or maybe a few smaller ones. No pits in the front, hard/solid material. Thanks for looking.