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40 x 30 mm
49 Ct small black boulder opal is a wonderful example of mother nature's skill
A beautiful small 3
A lovely full spectrum boulder opal with a dark body tone
light coloured boulder opal with rainbow colours and swirling off-whites and caramels
4.28 Ct 3D Wood replacement opal Type_Carving 40 x 30 mmA 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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