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Available in seven coin denominations — from the penny to the silver dollar — and offered in your choice of yellow gold filled or sterling silver
making them the longest-lasting burs available for demanding bench work
A foot pedal is included for convenient hands-free operation
and angled surfaces that standard flat stones cannot reach
Closeout No Opalescence Australian 10mm x 8mm Oval Boulder Opal Free Gift Eligible Available in seven coin denominationsBoulder Opal is found exclusively in Queensland, Australia, where veins and patches of precious opal form within rugged brown ironstone boulders. This gem was created over millions of years as rainwater dissolved silica from the earth's surface, depositing it into natural cavities within the ironstone. The ironstone backing provides natural reinforcement that makes Boulder Opal more resistant to cracks and fractures compared to other opals. This
