3.00 Ct wood replacement heart opal Crystal A one-of-a-kind heart boulder opal

A one-of-a-kind heart boulder opal heart with white stripes

A pastel rainbow boulder opal heart with a striped pattern

A bright purple

A large and stunning rainbow heart boulder opal with a purple-hue

A beautiful small pastel boulder opal with rainbow stripes

3.00 Ct wood replacement heart opal Crystal A one-of-a-kind heart 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