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36 Ct oval boulder opal boasts an impressive array of colours which span the majority of its surface
A very pretty green-blue boulder opal
A lovely round purple boulder opal
A lovely 2
lime green
2.51 Ct heart wood replacement opal Type_Single 36 Ct oval boulder opalA beautiful 2. 51 Ct wood replacement heart 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 the
