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A larger boulder opal heart with a thick green-blue opal stripe
A lovely blue swirly boulder opal heart
perfect for a ring or pendant
A lovely small purple boulder opal specimen
A small pastel heart boulder opal with light pink
6.85 Ct 3D Wood Replacement Opal Tucson A larger boulder opal heartA stunning 6. 85 Ct wood replacement opal in a classic oval 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 process
