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A lovely small green and purple boulder opal specimen shaped like a large tooth or tusk
51 Ct wood replacement heart opal
28 Ct wood replacement opal in a classic rectangle shape
~ 87 carats / 17
81 Ct opal pair is the perfect addition to any collection
3.53 Ct 3D Wood Replacement opal Mine_Yaraka A lovely small green andA lovely 3. 53 Ct 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 process results in the meticulous
