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A lovely green and blue rectangle boulder opal
A great bright green-blue boulder opal
green and caramel boulder opal from our inexpensive range
Add it to your collection and experience the natural wonder of this rare gemstone
36 Ct wood replacement opal in a classic squarish shape
5.12 Ct wood replacement opal Tucson A lovely green and blueA rare and unusual dark purple 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
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