Nice Quality Koroit Opal Rough/Preform 76.55cts Rare Red Band Green Fires Patterns Au

I have for sale a one of a Kind Koroit Opal Nut Preform from Queensland Australia. This one weighs 76.55cts and is 42x25x7mm,.,. It has Superb Double sided patterns, each totally different. Min pic, First side has a Red ironstone core with a nearly continuous Red/Pink Fire vein running around it. Then Classic Koroit pattern around the outer band with Bright electric Green Fires mixed in. The Fires go around the edges, onto the Back Face.  Different with Lots of Bright Greens, No red Core. Great stone. Unique, one off pendant or collectors stone once finished up. Thanks for looking.