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This stone is a random selection from a lot
Stone Type Corundum - Sapphire Cut Oval Cut Weight 6
Stone Type Opal - Black Cut Oval
Possible heat treatment Origin
47.7ct TW Boulder Opal Rub Parcel Bespoke Cutting This stone is a randomThis beautiful boulder opal rub parcel was mined from a deposit in Winton, Queensland, Australia. "Rubs" are partially preformed rough opals that have been trimmed and shaped to show their potential but are not polished. The images show the stones both wet and dry. These pieces are perfect for beginners just starting out with cutting and polishing opal to practice on. They are also great as as collectors pieces when kept in water or you can even use