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A larger boulder opal heart with a thick green-blue opal stripe
45 carat boulder opal has a rare combination of colors including orange
67 Ct purple wood replacement opal with a teardrop shape
including pink-red and orange-gold colours
larger boulder opal heart
5.88 Ct 3D Wood replacement opal Type_Tiny A larger boulder opal heartA lovely 5. 88 Ct wood replacement opal in a classic rectangle 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
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