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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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Collection:
Clean-faced opals
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10.80 Ct top gem green-blue boulder opal
10.80 Ct top gem green-blue boulder opal
10.67 Ct top gem grade oval boulder opal
10.67 Ct top gem grade oval boulder opal
10.30 Ct top gem rainbow boulder opal
10.30 Ct top gem rainbow boulder opal
1.35 Ct extra small boulder opal
1.35 Ct extra small boulder opal
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