Grey base Opal rough rub Coober Pedy 17.50cts Band of Green Blue fires to gamble 20x18x7mm Lot B4-A413 wk_auction Note: smaller size

Note: smaller size

16x12x8mm & 16x9x9mm

New South WalesType: Knobby Opal Formation RoughBody Tone: N4–N5 (Dark Base)Colour Presence: Bit of a colour bar visible

South AustraliaType: Seam Opal (Rough Rub)Body Tone: Grey basePlay-of-Colour: Band of green-blue fireForm: Rubbed surface showing partial colour zoneUse: Trimming

Grey base Opal rough rub Coober Pedy 17.50cts Band of Green Blue fires to gamble 20x18x7mm Lot B4-A413 wk_auction Note: smaller sizeGrey Base Opal Rough Rub 17. 50cts Coober Pedy, Band of Green Blue Fires to GambleLot Number: B4 A413Weight: 17. 50 caratsDimensions: 20 x 18 x 7 mm Details: Origin: Coober Pedy, South AustraliaType: Seam Opal (Rough Rub)Body Tone: Grey basePlay of Colour: Band of green blue fireForm: Rubbed surface showing partial colour zoneUse: Trimming, face chasing, or exploratory cutting Description: This 17. 50ct Coober Pedy opal rough rub shows a single