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Boulder Opal Sort by: under $100 $100 - $200 $200 - $500 $500 - $1000 over $1000   R0508 Price: $770.00 Description: Boulder opal from Koroit (Queensland). 'Nuts' and 'plates' in ironstone; good for cutting or polishing as specimens, blue and green in colour. 2 pieces. Compare products R0500 Price: $1,150.00 Description: Boulder opal from Winton (Queensland). A good cutting parcel of blue, green and a little red amongst the rubs (partially cleaned material) and pre-cleaned stones. 67 pieces. Compare products R0509 Price: $1,200.00 Description: Boulder opal from Queensland. A good cutting parcel of blue, green and a little orange amongst the partially cleaned stones, some have lines of colour to 'chase' ! 64 pieces. Compare products R0503 Price: $1,500.00 Description: Boulder opal from Koroit (Queensland). Good for cutting or polishing as specimens, blue and green in colour. 3 pieces. Compare products