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A one-of-a-kind heart boulder opal heart with white stripes
A large green-blue opal that reminds us of the reefs and tides
A beautiful blue and green triangle boulder opal
A lovely boulder opal from our inexpensive range
We are always huge fans of this unusual colour combination
4.70 Ct 3D Wood Replacement opal Type_Single A one-of-a-kind heart boulder opalA 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
