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Australian boulder opal grades
What is the difference between Australian black opal and Australian boulder opal?
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Australian boulder opal grades
What is the difference between Australian black opal and Australian boulder opal?
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12.05 Ct oval boulder opal
12.05 Ct oval boulder opal
12.70 Ct rainbow boulder opal
12.70 Ct rainbow boulder opal
12.81 Ct top gem boulder opal
12.81 Ct top gem boulder opal
12.84 Ct 'pink stripe' boulder opal
12.84 Ct 'pink stripe' boulder opal
13.04 Ct free-form boulder opal
13.04 Ct free-form boulder opal
13.34 Ct 'brushstrokes' boulder opal
13.34 Ct 'brushstrokes' boulder opal
13.47 Ct rainbow boulder opal
13.47 Ct rainbow boulder opal
13.56 Ct gem boulder opal
13.56 Ct gem boulder opal
14.00 Ct unusual lime green gem boulder opal
14.00 Ct unusual lime green gem boulder opal
14.14 Ct green-blue boulder opal
14.14 Ct green-blue boulder opal
14.38 Ct flashy rainbow boulder opal pair
14.38 Ct flashy rainbow boulder opal pair
16.10 Ct top gem boulder opal
16.10 Ct top gem boulder opal
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