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28 Ct wood replacement opal in a classic rectangle shape
47 Ct triangle boulder opal with gem-grade rainbow stripes
A large green-blue opal that reminds us of the reefs and tides
A stunning rainbow heart boulder opal with a purple-hue
A beautiful small pastel boulder opal with rainbow stripes
4.28 Ct wood replacement heart opal Type_Pipe 28 Ct wood replacement opalA lovely 4. 28 Ct wood replacement heart opal. 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 process results in the
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