6.36 Ct Wood replacement opal Type_Single 45 carat boulder opal has

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

A bright purple

A beautiful free-form boulder opal with a rainbow colours including broad rolling flashes of yellow

A rare and unusual dark purple wood replacement opal

A stunning purple 2

6.36 Ct Wood replacement opal Type_Single 45 carat boulder opal hasA lovely 6. 36 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