Closeout No Opalescence Australian 25mm x 18mm Oval Boulder Opal Kagan 4mm Small Ring Width 1

4mm Small Ring Width 1

1 mm Material High-impact nylon (unbreakable lightweight plastic) Readout Type Dial Measurement Capability Inside and outside Origin Switzerland Includes Carrying case What's Included

The included 13W bulb (113

May also be suitable for other 120V kilns using the same style of stepless infinite control

Medium grit diamond polishing wheel for scratch removal on stones

Closeout No Opalescence Australian 25mm x 18mm Oval Boulder Opal Kagan 4mm Small Ring Width 1Boulder Opal is found exclusively in Queensland, Australia, where veins and patches of precious opal form within rugged brown ironstone boulders. This gem developed over millions of years as rainwater dissolved silica from the earth's surface and deposited it into natural cavities within the ironstone. The result is a stone of exceptional durability the ironstone backing provides natural reinforcement that makes Boulder Opal more resistant to cracks