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03 Ct wood replacement opal in a hexagon shape
A wonderful rainbow rectangle boulder opal
A beautiful pill-shaped boulder opal with bright green and blue colours
20 Ct wood replacement opal
A great bright green-blue boulder opal
2.50 Ct 3D Wood replacement opal Parcel 03 Ct wood replacement opalA stunning purple 2. 50 Ct wood replacement opal in a 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 remarkable
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