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3.79 Ct wood replacement opalA lovely green and purple 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

49 Ct small black boulder opal is a wonderful example of mother nature's skill

A gorgeous purple boulder opal with flecks of green

A lovely small light triangle opal with pastel colours

Consequently

A lovely free-form wood replacement opal

A beautiful

In cases where the silica infiltrates organic material before complete decomposition occurs

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

A beautiful rainbow striped boulder opal

black body tone

the organic molecules are replaced by silica

A triangle boulder opal with rainbow colours and an unusual golden body tone / background