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A stunning blue boulder opal in a classic oval shape
A lovely blue
79 Ct wood replacement opal in a modern half circle shape
but because the remaining internal structures create a mesmerizing inner world that is visible through the transparent and translucent opal
A lovely purple and grey boulder opal heart
3.57 Ct carved flower opal Type_Single A stunning blue boulder opalA beautiful small 3. 57 Ct flower carving from 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
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