4.70 Ct 3D Wood Replacement opal Type_Single A lovely ocean-toned boulder opal

A lovely ocean-toned boulder opal

A beautiful blue and green triangle boulder opal

A beautiful small 3

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 lovely ocean-toned 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