Australian Opals: An Introduction - International Gem Society
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Australian Opal Stone 3 Carats 7445 | Loose Solid Opals
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Bright Natural Australian Crystal Opal Solid Cut Stone (1802)
Australian Opal 6 X 10mm 0.62ct Natural Solid Unset Dark Crystal Opal Lightning Ridge Loose Opal Stone Polished Gemstone - Etsy
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Talisman Gemstone! Australian Opal - Real Treasure of the Nature! – Fine and Faith
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Natural Amazing Pink Australian Opal Oval Shape Loose Gemstone
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1 Carat Natural Australian Opal Stone From Coober Pedy ( 9x7x3 mm ) | eBay
Opal: Australia's troubled gemstone - Jeweller Magazine: Jewellery News and Trends
1.95 cts Australian Opal, Doublet Stone, Cabochon - Absolute Opals & Gems
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Colour Play' Australian Semi-Black Opal - Black Star Opal
Opal - The Australian Museum
Natural Australian Opal Stone 0.5 Carats ( 10x5x2 mm ) | eBay
Australian Black Opal Gemstone 11.97ct - Opal Minded
Australian Opals: An Introduction - International Gem Society
Loose 20.87ct Australian Boulder Opal Stone | Burton's – Burton's Gems and Opals
