3.00 Ct wood replacement heart opal Crystal A large matrix boulder opal

A large matrix boulder opal pair with rainbow colours

A lovely opal pair

A pastel rainbow boulder opal heart with a striped pattern

A beautiful matrix boulder opal with rainbow colours

3.00 Ct wood replacement heart opal Crystal A large matrix boulder opalA lovely 3. 00 Ct wood replacement heart 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