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3.00 Ct wood replacement heart opalA lovely 3. 00 Ct wood replacement heart 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

A pretty small boulder opal specimen from our Yaraka opal mine

A gorgeous green-blue boulder opal

Stands on its own base and back (in the same direction)

A green and blue trapezoid shaped boulder opal with a jet black body tone

A sweet extra small boulder opal heart pair

A gorgeous oval boulder opal with pastel rainbow colours

21 Ct boulder opal is a rare gem that showcases bright pink and green with a black body tone

A beautiful crystal teardrop opal

A lovely two piece boulder opal shell set

A lovely round purple boulder opal

94 Ct wood replacement opal in a modern hexagon shape

A lovely boulder opal heart with a great stripy pattern