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Natural rough shaped piece of boulder opal from Winton, Queensland

The parent material that the opal is deposited on is generally quite hard in comparison to some other fields.
Being based on such a hard material generally allows the stone to be polished to a higher lustre.

Blocked out (sawn down) to reduce weight,
Rule in Millimeters
Measurements are generally rounded down and approximate

The material is generally photographed wet to bring out the highlights of the stone.

Colour: Please note the camera has been white-balanced to give truer colours NO Photo Shopped enhancement