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2.50 Ct 3D Wood replacement opalA stunning purple 2. 50 Ct wood replacement opal in 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

A stunning rectangle green wood replacement opal

A lovely light green boulder opal

96 Ct wood replacement opal in a soft half-circle shape

~ 87 carats / 17

60 x 35 mm

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

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

A stunning

A lovely pentagon boulder opal with a rolling bright blue and green flash

A very unusual and bright sea green boulder opal

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

46 Ct purple wood replacement opal with a teardrop shape