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A pretty extra small heart boulder opal
A very pretty pair of oval boulder opals
Their round shape and swirly patterns remind us of two beautiful planets
A lovely 8
A pretty pair of pastel teardrop boulder opals
4.48 Ct 3D Wood Replacement Opal Colour_Pink A pretty extra small heartA lovely 4. 48 Ct wood replacement opal in a classic rectangle 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
