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5.32 Ct wood replacement opalA lovely free form 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 meticulous

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

with bright green colours

but because the remaining internal structures create a mesmerizing inner world that is visible through the transparent and translucent opal

not only because it is an opalised fossil

perfect for a ring or pendant

A large electric blue

A beautiful rainbow striped boulder opal

A beautiful oval boulder opal with strong deep green colours

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

A lovely small 2

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

81 Ct opal pair is the perfect addition to any collection