3.53 Ct 3D Wood Replacement opal Mine_Yaraka 36 Ct oval boulder opal

36 Ct oval boulder opal boasts an impressive array of colours which span the majority of its surface

A small and bright blue boulder opal

28 Ct wood replacement opal in a classic rectangle shape

A lovely small green and purple boulder opal specimen shaped like a large tooth or tusk

black body tone

3.53 Ct 3D Wood Replacement opal Mine_Yaraka 36 Ct oval boulder opalA lovely 3. 53 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 meticulous