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47 Ct triangle boulder opal with gem-grade rainbow stripes
99 Ct wood replacement opal
A stunning
blue and grey boulder opal specimen
A lovely 5
5.33 Ct 3D Wood Replacement opal Price_Mid-range 47 Ct triangle boulder opalA beautiful 5. 33 Ct wood replacement 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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