Huge Part Rubbed Koroit Opal Nut/Rough Specimen 649cts Green/Blue Fires/Vein/Patterns Qld Au

I have for sale a Very Nice Part Rubbed, Koroit Opal Half Nut from Queensland Australia. This one weighs 649cts and is 74x59x19mm. It is Ironstone base material, Red Base in the middle. There is Nice Green/and Some Blues in most of the skin on this piece. I have exposed some of it. Mixed patterns across the piece. Also sn area where the skin went deeper, so will need to get a dremmel into clean that out. The colour will go over most of this once cleaned up. A rare and large Specimen chunk, or Slice up and cut some usable stones for pendants and similar. Plenty of Options.. Thanks for looking..