4.70 Ct 3D Wood Replacement opal Type_Single 29 Ct boulder opal is

29 Ct boulder opal is an impressive gem that showcases blues

A large green-blue opal that reminds us of the reefs and tides

A lovely ocean-toned boulder opal

A beautiful small 3

4.70 Ct 3D Wood Replacement opal Type_Single 29 Ct boulder opal isA 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