Natural Multi Color Opal Flashing Boulder 19.77 Ct. Free Form Cabochon Gemstone From AustraliaTreasure of Gems & Jewelry4.4(213)$1Feb 08, 2026
Natural Multi - Color Boulder Flashing 21.40 Ct. Free Form Cabochon Shape 31 x 16 Mm. Gemstone FromTreasure of Gems & Jewelry4.4(213)$1Feb 08, 2026
2.53Ct Welo Black Opal Faceted Polished - Ethiopian OpalKsmith Heritage Auctioneers4.3(45)See Sold PriceJul 27, 2025
Sold22.9 ct Australian Boulder OpalTitle: 22.9 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 22.9 Size/Dimensions: 30 mm x 14 mm x 6.6 mm Additional Information: Koroit Opal Fields No Reserve: This lot starts at $1See Sold Price
Sold5.92 ct Australian Boulder OpalItem: 5.92 ct Australian Boulder Opal Gemstones: Opal Carat Weights: 5.92 Size/Dimensions: 17.5 mm x 12.4 mm x 4.0 mm Please note that this lot has a confidential reserve. When you leave a bid in advaSee Sold Price
Sold22.92 ct Australian Boulder Opal Gemstone Cabochon22.92 ct Boulder Opal cabochon. 28 x 18mm. Queensland Australia origin gemstone. Perfect shape & size for a lovely pendant.See Sold Price
Sold10.74 ct Australian Boulder OpalTitle: 10.74 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 10.74 Size/Dimensions: 26 mm x 12 mm x 4.5 mm Additional Information: Koroit Opal Fields Please note that this lot has aSee Sold Price
Sold10.45 ct Australian Boulder OpalTitle: 10.45 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 10.45 Size/Dimensions: 30.4 mm x 10.0 mm x 4.2 mm Additional Information: Koroit Opal Fields No Reserve: This lot startsSee Sold Price
Sold9.81 ct Australian Boulder OpalItem: 9.81 ct Australian Boulder Opal Gemstones: Opal Carat Weights: 9.81 Size/Dimensions: 16.7 mm x 15.2 mm x 4.2 mm No Reserve: This lot starts at $1 and has no reserve as a courtesy so that collectSee Sold Price
Sold3.55 ct Australian Boulder OpalItem: 3.55 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 3.55 Size/Dimensions: 12.2 mm x 10.8 mm x 3.5 mm No Reserve: This lot starts at $1 and has no reserve as a courtesy so thatSee Sold Price
Sold7.28 ct Australian Boulder OpalItem: 7.28 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 7.28 Size/Dimensions: 14.5 mm x 9.5 mm x 5.0 mm No Reserve: This lot starts at $1 and has no reserve as a courtesy so thatSee Sold Price
Sold26.03 ct Australian Boulder OpalItem: 26.03 ct Australian Boulder Opal Gemstones: Boulder Opal Carat Weights: 26.03 Size/Dimensions: 23.1 mm x 20.9 mm x 7.2 mm Additional Information: Australian Koroit Boulder Opal No Reserve: ThisSee Sold Price
Sold10.04Â ct Australian Boulder OpalItem: 10.04Â ct Australian Boulder Opal Gemstones: Opal Carat Weights: 10.04 Size/Dimensions: 17.9Â mm x 15.6 mm x 4.9 mm No Reserve: This lot starts at $1 and has no reserve as a courtesy so that colSee Sold Price
SoldCt Natural Loose Australian Koroit Yowah Boulder Opal Cabochon17x13x4mm Weight: 6 CaratSee Sold Price
SoldCt Natural Loose Australian Koroit Yowah Boulder Opal Cabochon12x9x6mm Weight: 7 CaratSee Sold Price
SoldAustralian Boulder Opal Rough: Mesmerizing Spectrum of Nature's PaletteDimension: 15-20 mm Weight: 80 ct Estimate:$250-$450 In recent auctions, Australian Boulder Opals, especially in their rough form, have captured the fascination of many collectors. An analogous specimSee Sold Price
SoldAustralian Boulder Opal Rough: Mesmerizing Spectrum of Nature's PaletteDimension: 19x13x9 mm Weight: 62.5 ct Estimate:$250-$450 In recent auctions, Australian Boulder Opals, especially in their rough form, have captured the fascination of many collectors. An analogous spSee Sold Price
SoldAustralian Boulder Opal Rough: Mesmerizing Spectrum of Nature's PaletteDimension: 18-30 mm Weight: 75.5 ct Estimate:$250-$450 In recent auctions, Australian Boulder Opals, especially in their rough form, have captured the fascination of many collectors. An analogous specSee Sold Price
Sold310 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform RoughDimension: 13 TO 25 mmSee Sold Price
Sold48 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform RoughDimension: 17 to 24 mmSee Sold Price
Sold8.8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform CabochonDimension: 18 x 13 x 4 mmSee Sold Price
Sold147 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform RoughDimension: 45 x 25 mmSee Sold Price
Sold7.9 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform CabochonDimension: 13 X 11 x 4 CmSee Sold Price
Sold6.5 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform CabochonDimension: 20 X 9 x 4 CmSee Sold Price
Sold8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform CabochonDimension: 21 X 15 x4 CmSee Sold Price
SoldAustralian koroit boulder opal-33.65 ct.Australian koroit boulder opal-33.65 ct. Reserve: $50.00 Shipping: Domestic: Flat-rate of $10.00 to anywhere within the contiguous U.S. International: Foreign shipping rates are determined by destinatSee Sold Price
SoldAustralian Koroit Matrix Boulder Opal: Vibrant Tapestry of Nature's BrillianceDimension: 17x9x3.6 mm Weight: 4.85 Ct Estimate: $220-$460 In recent auctions, Australian Koroit Matrix Boulder Opals have witnessed an increasing demand. An opal of similar quality and pattern was auSee Sold Price
