2.01 Ct teardrop wood replacement opal Type_Set A gorgeous purple boulder opal

A gorgeous purple boulder opal with flecks of green

40 x 30 mm

A lovely extra small marquise shaped boulder opal

A beautiful and rare bright green crystal  / wood replacement boulder opal

A stunning bright green-blue boulder opal

2.01 Ct teardrop wood replacement opal Type_Set A gorgeous purple boulder opalA beautiful 2. 01 Ct wood replacement opal with a pin fire pattern in purple and green colours. 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