Very Nice Koroit Fossil/Crystal Opal Cab/Preform 4,04cts Bright Orange/Green Fires rare stone

I have for sale a very nice and bright Matrix Opal Final preform from Koroit, Queensland Australia. This one weighs 4.04cts and is 13x12x3.5mm. nearly a triangle shape, bright Orange/Red and Green/Blues over all but the flat spot on the top. Small area of sand. beautiful little gam piece, once final polish and set, be a stunner. Thanks for looking.