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4.28 Ct 3D Wood replacement opalA lovely 4. 28 Ct wood replacement opal in a classic squarish 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

85 Ct boulder opal features a captivating green hue in a versatile half-circle shape

A lovely light green boulder opal

with a lovely swirly pattern

A beautiful 3

A gorgeous green and blue circle boulder opal

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

This remarkable process results in the meticulous preservation of intricate internal structures

51 Ct wood replacement heart opal

lime green

22 Ct wood replacement opal with a long narrow triangle shape

A beautiful larger teardrop sea green and turquoise coloured boulder opal

A very dark and mysterious boulder opal from our Mt