11.03 Ct Wood replacement opal Parcel 49 Ct small black boulder

49 Ct small black boulder opal is a wonderful example of mother nature's skill

purple and green stripes

matched in colours but not in size

29 Ct boulder opal is an impressive gem that showcases blues

A beautiful small heart boulder opal

11.03 Ct Wood replacement opal Parcel 49 Ct small black boulderA lovely 11. 03 Ct wood replacement opal in a hexagon 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 process