8.43 Ct wood replacement opal Shape_Heart A lovely boulder opal specimen

A lovely boulder opal specimen from our Yaraka opal mine

A lovely 12

A beautiful bright green gem small boulder opal

A beautiful green and blue free-form boulder opal

A lovely striped heart boulder opal

8.43 Ct wood replacement opal Shape_Heart A lovely boulder opal specimenA lovely 8. 43 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 results