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9.46 Ct wood replacement opalA lovely 9. 46 Ct purple wood replacement opal with a teardrop 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

A wonderful rainbow rectangle boulder opal

the wood structure remains visible within the opal

and turquoise

As a centrepiece this opal will be amazing in any jewelry creation

A lovely small and colourful boulder opal specimen

20 mm thick

It also has a jet black body tone

A pretty half-circle wood replacement opal with light green and purple colours

A beautiful extra small green-blue boulder opal

47 Ct triangle boulder opal with gem-grade rainbow stripes

A lovely colourful boulder opal with a swirly pattern

they boast a unique caramel colour with a hint of green and pink