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6.89 Ct 3D Wood Replacement OpalA lovely 6. 89 Ct wood replacement opal in a classic rectangle 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

the wood structure remains visible within the opal

A small triangle boulder opal with great rolling rainbow colours

20 mm thick

A beautiful wavy boulder opal from our inexpensive range

52 Ct ocean-toned boulder opal radiates a striking green-blue hue with a dark body tone and flattering organic shape

A beautiful rainbow pair of heart boulder opals

32 Ct wood replacement heart opal

you receive a 15% discount on them

Mined by Sue at her Yaraka opal mine in Queensland

49 Ct wood replacement opal in a teardrop shape

A gorgeous teardrop boulder with greens and purple colours plus caramel stripes

A very pretty rainbow boulder opal with a darker lilac-hued background