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A lovely blue
A beautiful green and blue free-form boulder opal
94 Ct wood replacement opal in a modern hexagon shape
A lovely pastel and caramel boulder opal pair
29 Ct boulder opal is an impressive gem that showcases blues
8.43 Ct wood replacement opal Shape_Heart A lovely blueA lovely 8. 43 Ct wood replacement opal in a hexagon 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 results
