4.28 Ct 3D Wood replacement opal Type_Carving A lovely full spectrum boulder

A lovely full spectrum boulder opal with a dark body tone

We don't get these very often

A beautiful narrow stripy boulder opal

A beautiful light green and blue boulder opal

A lovely small teardrop boulder opal with rainbow stripes

4.28 Ct 3D Wood replacement opal Type_Carving A lovely full spectrum boulderA 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