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featuring swirly blues and a bright rolling green flash at the top
A very unusual rainbow boulder opal
An amazing extra large striped boulder opal
with a lovely clean-face
A lovely small and colourful boulder opal
9.73 Ct 3D wood replacement opal Colour_Green featuring swirly blues and aA beautiful purple 9. 73 Ct wood replacement opal in a classic teardrop shape. What is Wood Replacement opal? Opal formation commences when silica dissolves in water. At our Russells opal mine we have found that this silica solution occupies a void most probably left by decaying tree roots or branches. In cases where the silica infiltrates organic material before complete decomposition occurs, the organic molecules are replaced by silica. This
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