Lightning Ridge Knobby opal formation rough 12.00cts Bright flash of Bright Green/Yellow fires 19x15x10mm Lot B4-A173 wk_end_auction and this large

and this large

and this rough holds the promise of a unique gemstone

untouched knobby opal formation

and ready for setting in fine jewellery

Lightning Ridge Knobby opal formation rough 12.00cts Bright flash of Bright Green/Yellow fires 19x15x10mm Lot B4-A173 wk_end_auction and this largeLot: B4 A173Size: 19 x 15 x 10mmWeight: 12. 00 caratsOrigin: Lightning Ridge, Australia This knobby opal formation rough from Lightning Ridge features a bright flash of green and yellow fire, making it an exciting gamble stone for lapidaries and collectors. With its natural formation and striking color, this opal is ready for those willing to take the chance and see what lies within. Natural & Untreated Bright Green & Yellow Flash Fire Authentic