2.13 Ct wood replacement opal Type_Pair matched in colours but not

matched in colours but not in size

green and blue boulder opal

35 Ct wood replacement opal in a free-form shape

43 Ct wood replacement opal in a hexagon shape

24 Ct bright ocean boulder opal boasts a mesmerizing teardrop shape with stunning ocean green and blue tones

2.13 Ct wood replacement opal Type_Pair matched in colours but notA lovely small 2. 13 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