12.91 Ct 3D Wood replacement opal Type_Carving 49 Ct wood replacement opal

49 Ct wood replacement opal in a classic oval shape

A beautiful wavy boulder opal from our inexpensive range

A beautiful and unique large triangle boulder opal

45 carat boulder opal has a rare combination of colors including orange

and turquoise

12.91 Ct 3D Wood replacement opal Type_Carving 49 Ct wood replacement opalA lovely 12. 91 Ct wood replacement opal in a large geometric 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