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A very large and rare boulder opal from our Mt
A beautiful and unique large triangle boulder opal
A small pastel heart boulder opal with light pink
A beautiful free-form boulder opal with rainbow colours
7.87 Ct 3D Wood replacement opal Background_Light A very large and rareA lovely 7. 87 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
