Quality Coober Pedy Fossil Shell Opal Gem Rub/specimen 18cts Multicolour Fires

I have for sale a Very Nice Rubbed shell Opal specimen from Coober Pedy Australia. This one weighs 18cts and is 28x16x11mm,.,. It has Skin Shell, Thicker in places over the whole thing with Multicolour Fires/Patterns. Some bright. A few slight Potch streaks, but should come out. This has No Cracks, Very Nice piece, with Sand in the back/Dome of the shell. (left in for stability. Could be cleaned out. Superb specimen, dont see many like this. Will polish up a cracking Specimen for a Collection somewhere,.,.  Thanks for looking,.,.,.