4.67 Ct wood replacement opal Type_Single A pretty half-circle wood replacement

A pretty half-circle wood replacement opal with light green and purple colours

A dreamy large ocean boulder opal with bright green and blue colours

A lovely teardrop boulder opal with pink

29 Ct wood replacement opal

4.67 Ct wood replacement opal Type_Single A pretty half-circle wood replacementA lovely 4. 67 Ct purple wood replacement opal with a teardrop 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