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4.67 Ct wood replacement opalA lovely 4. 67 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

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

A lovely 2

perfect for a ring or pendant

A lovely ocean-toned boulder opal

A beautiful pill-shaped boulder opal with bright green and blue colours

A lovely small rainbow boulder with a lighter lilac-tone background

24 Ct bright ocean boulder opal boasts a mesmerizing teardrop shape with stunning ocean green and blue tones

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

48 x 45 mm

An amazing extra large striped boulder opal

A wonderful rainbow boulder opal with an unusual darker lilac body tone

47 Ct triangle boulder opal with gem-grade rainbow stripes