3.31 Ct carved flower opal Colour_orange A large and stunning rainbow

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

28 Ct wood replacement heart opal

A lovely blue swirly boulder opal heart

10 mm thick

46 Ct purple wood replacement opal with a teardrop shape

3.31 Ct carved flower opal Colour_orange A large and stunning rainbowA beautiful small 3. 31 Ct flower carving from 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