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A stunning light opal with pastel rainbow colours and a pin fire pattern
A beautiful black boulder opal with bright greens and blues
A beautiful bright green gem small boulder opal
An oval boulder opal with green and purples and a semi-dark body tone / background
A lovely extra small triangle boulder opal pair
2.15 Ct 3D Wood replacement opal Shape_Geometric A stunning light opal withA lovely 2. 15 Ct wood replacement opal in a classic squarish 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 remarkable
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