8.23 Ct wood replacement opal Price_Mid-range A lovely small rainbow and

A lovely small rainbow and caramel boulder opal

We don't get these very often

A lovely deep purple and violet boulder opal

with a bright green tip

A triangle matrix boulder opal

8.23 Ct wood replacement opal Price_Mid-range A lovely small rainbow andA stunning green, blue and 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