Untouched Knobby opal formation rough of Lightning Ridge 21.20cts Crystal on Black base with Blues & greens 31x21x10mm Lot B4-A727 ToClear offering a moderate challenge with

offering a moderate challenge with good reward for skilled cutters

yet still holds plenty of potential for further shaping or refining

Type: Dark Amber Knobby Opal Rough (Split Pair)

ready-to-work pair with visual bling and room to play

Untouched Knobby opal formation rough of Lightning Ridge 21.20cts Crystal on Black base with Blues & greens 31x21x10mm Lot B4-A727 ToClear offering a moderate challenge withLot TitleCrystal on Black Base Knobby Lightning Ridge Rough with Blues & Greens Lot NumberB4 A727 DetailsWeight: 21. 20 ctSize: 31 x 21 x 10 mmOrigin: Lightning Ridge, AustraliaType: Knobby Opal FormationUse: Carving Gamble CuttingColour: Blues & greens DescriptionUntouched knobby opal formation from Lightning Ridge featuring crystal cap on a black base. Flashes of blue and green appear through the skin in several spots, with strong contrast expected