3.93 Ct 3D Wood replacement opal Type_Pair A lovely pentagon boulder opal

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

4 mm is it also a very versatile size

A lovely small teardrop boulder opal with rainbow stripes

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

A unusual pastel pink

3.93 Ct 3D Wood replacement opal Type_Pair A lovely pentagon boulder opalA beautiful 3. 93 Ct wood replacement opal in a lovely half circle 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