Yellow dominant Knobby formation rough 6.75cts Lightning Multi colours to gamble 14x12x8mm Lot B4-A018 wk_end_auction Coober Pedy remains a world-famous

Coober Pedy remains a world-famous source of high-quality opals

Type: Crystal Opal Rough

Dimensions: 13x11x5mm

or keeping as a prized specimen

and this piece is a prime example

Yellow dominant Knobby formation rough 6.75cts Lightning Multi colours to gamble 14x12x8mm Lot B4-A018 wk_end_auction Coober Pedy remains a world-famousLot Title: Yellow Dominant Knobby Formation Rough 6. 75cts Lightning Multi Colours Lot Number: B4 A018 Details: Origin: Lightning Ridge, Australia Type: Knobby Formation Rough Carat Weight: 6. 75cts Dimensions: 14x12x8mm Features: Yellow dominant opal with flashes of multi colours Natural knobby formation Ideal for gambling, cutting, and polishing Description: This 6. 75ct knobby opal formation from Lightning Ridge boasts a yellow dominant base with