6.89 Ct 3D Wood Replacement Opal Type_Carving Their round shape and swirly

Their round shape and swirly patterns remind us of two beautiful planets

Three lovely small dark purple boulder opal pieces

A triangle boulder opal with rainbow colours and an unusual golden body tone / background

A classic oval boulder opal with a gorgeous pink and green fine-stripe pattern

A fun free-form boulder opal with green

6.89 Ct 3D Wood Replacement Opal Type_Carving Their round shape and swirlyA lovely 6. 89 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