5.12 Ct wood replacement opal Tucson the wood structure remains visible

the wood structure remains visible within the opal

45 carat boulder opal has a rare combination of colors including orange

A beautiful extra small green-blue boulder opal

36 Ct wood replacement opal in a classic squarish shape

A great bright green-blue boulder opal

5.12 Ct wood replacement opal Tucson the wood structure remains visibleA rare and unusual dark purple 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 process results in