4.94 Ct 3D Wood replacement opal Tucson A beautiful boulder opal with

A beautiful boulder opal with green

matched in colours but not in size

Mined by Sue at her Yaraka opal mine in Queensland

A stunning green-blue boulder opal with a light pink swirl

4.94 Ct 3D Wood replacement opal Tucson A beautiful boulder opal withA lovely 4. 94 Ct wood replacement opal in a modern hexagon shape. 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