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5.88 Ct 3D Wood replacement opalA lovely 5. 88 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

A stunning rectangle green wood replacement opal

green and blue colours

A wonderful rainbow rectangle boulder opal

35 Ct wood replacement opal in a free-form shape

A pretty pair of pastel teardrop boulder opals

36 Ct oval boulder opal boasts an impressive array of colours which span the majority of its surface

blue and pink stripes

We are always huge fans of this unusual colour combination

This beautiful 15

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

A lovely rectangle boulder opal with a pinfire rainbow pattern

49 Ct wood replacement opal in a classic oval shape