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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:
Broad & rolling flashes
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9.22 Ct matrix boulder opal
9.22 Ct matrix boulder opal
7.21 Ct oval boulder opal
7.21 Ct oval boulder opal
4.99 Ct top gem grade boulder opal
4.99 Ct top gem grade boulder opal
34.48 Ct large free-form boulder opal
34.48 Ct large free-form boulder opal
2.34 Ct extra small boulder opal
2.34 Ct extra small boulder opal
12.84 Ct 'pink stripe' boulder opal
12.84 Ct 'pink stripe' boulder opal
18.93 Ct top gem grade boulder opal
18.93 Ct top gem grade boulder opal
8.60 Ct broad flash boulder opal
8.60 Ct broad flash boulder opal
9.04 Ct free-form boulder opal
9.04 Ct free-form boulder opal
8.28 Ct broad flash boulder opal
8.28 Ct broad flash boulder opal
8.97 Ct rolling flash boulder opal
8.97 Ct rolling flash boulder opal
5.10 Ct rainbow boulder opal
5.10 Ct rainbow boulder opal
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