4.86 Ct 3D Wood replacement opal Inner world We cut it into a

We cut it into a circle to give it a a modern edge

In cases where the silica infiltrates organic material before complete decomposition occurs

A small and bright blue boulder opal

A lovely 8

A beautiful extra small green-blue boulder opal

4.86 Ct 3D Wood replacement opal Inner world We cut it into aA lovely 4. 86 Ct wood replacement opal in a classic rectangle 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