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2.13 Ct heart wood replacement opalA lovely 2. 13 Ct wood replacement heart 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

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

87 Ct wood replacement opal in a classic oval shape

A lovely small teardrop boulder opal from our inexpensive range

the wood structure remains visible within the opal

A lovely pink and green boulder opal from our inexpensive range

light coloured boulder opal with rainbow colours and swirling off-whites and caramels

A lovely lighter green and purple boulder opal

green and blue boulder opal

A lovely large triangle boulder opal pair

A stunning small pastel teardrop boulder opal

A lovely rectangle boulder opal with a pinfire rainbow pattern

47 Ct triangle boulder opal with gem-grade rainbow stripes