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A gorgeous free-form striped boulder opal
49 Ct small black boulder opal is a wonderful example of mother nature's skill
A lovely small teardrop boulder opal with rainbow stripes
A beautiful light green and blue boulder opal
4.28 Ct 3D Wood replacement opal Type_Carving A gorgeous free-form striped boulderA lovely 4. 28 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
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US$ 4900.00
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