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Natural pieces of Nobby opal material from Lightning Ridge, Australia.
These pieces are great examples of “opal in the rough”
Hours of fun for the lapidary who is happy to have a gamble.
There still may be some hidden treasures

Wetted to bring out colours
Rule in Millimetres
Measurements are generally rounded down and approximate

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