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A beautiful blue and green triangle boulder opal
A lovely ocean-toned boulder opal
A lovely small hexagon boulder opal
29 Ct boulder opal is an impressive gem that showcases blues
with bright green colours
4.70 Ct 3D Wood Replacement opal Type_Single A beautiful blue and greenA beautiful 4. 70 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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