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2.39 Ct wood replacement opalA beautiful 2. 39 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

13 Ct wood replacement opal

A unique pair of boulder opals with bright rolling purple-blue colours on the bottom half of the teardrops

A lovely larger heart boulder opal

A beautiful round boulder opal with green veins on a dark ironstone face

blue and green colours

A beautiful stripy rainbow boulder opal with a honey-hued lighter body tone

28 Ct wood replacement opal in a classic rectangle shape

29 Ct boulder opal is an impressive gem that showcases blues

A beautiful free-form boulder opal with swirls of green and blue colours

A stunning bright green-blue boulder opal

blue and pink colours

A beautiful rectangle boulder opal that has has a ~2