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3.51 Ct wood replacement opalA stunning rectangle green 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

A lovely narrow free-form boulder opal with colourful stripes down one side

13 Ct wood replacement opal

We are always huge fans of this unusual colour combination

A lovely large round boulder opal with a light body tone (background) and light pastel colours

blue and purple wood replacement opal

A lovely 5

A stunning purple 2

A lovely extra small marquise shaped boulder opal

A lovely 12

When you purchase 2 or more opals from our 'Create a parcel' category

A beautiful rainbow striped boulder opal

A lovely large blue triangle boulder opal