25 ct Free form Andamooka opal cabochon from Australia

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This is a treated matrix opal from the Andamooka opal fields of Australia. These stones are often mined with a white or cream colored matric and are then treated to give them a darker background. The treatment is considered safe and an industry standard and permanent. The appearance of stones like this is a lot like glitter, pressed into black cement.

Size: 39.8mm x 22.5mm x 5.7mm

Weight: 25.6 carats

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