Closeout Some Opalescence Australian 30mm x 20mm Oval Boulder Opal Glardon-Vallorbe direct reading across a range

direct reading across a range of 0–220°F

adding versatility for additional bench techniques

Ready for stone setting and ring sizing upon receipt

Polishing and shaping of carbide and high-speed steel gravers

a well-known maker of watch and clockmaking tools in the early 1800s

Closeout Some Opalescence Australian 30mm x 20mm Oval Boulder Opal Glardon-Vallorbe direct reading across a rangeBoulder Opal is found exclusively in Queensland, Australia, where veins and patches of precious opal form within rugged brown ironstone boulders. These gems were created over millions of years as rainwater dissolved silica from the earth's surface and deposited it into natural cavities within the ironstone. The ironstone backing provides natural reinforcement, making Boulder Opal more resistant to cracks and fractures compared to other opal varieties.