2.45 Ct wood replacement opal Type_Tiny 45 carat boulder opal has

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

A beautiful small striped boulder opal with rainbow colours

A larger boulder opal heart with a thick green-blue opal stripe

A very unusual and bright sea green boulder opal

perfect for a ring

2.45 Ct wood replacement opal Type_Tiny 45 carat boulder opal hasA lovely small 2. 45 Ct wood replacement opal. 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 results in the