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Parcel of Seam opal rubbed down, from Lightning Ridge area of Australia.

They are generaly on very dark base which brings out the vibrant colours.
These opal rubs would be great to make specimens.or posibly finished gemstones.
The faces of these have been caved to remove the clay .
I think that these do have to potential in making some beautiful stones but will be thinner examples of the iconic Lightning Ridge Opal

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

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