Loose Stones & Beads

3.55 ct Australian Boulder Opal First Image

#image-loader-main { display: none; }

3.55 ct Australian Boulder Opal First Image

3.55 ct Australian Boulder Opal

Total Sales1 Sold

Median Sale Price

Sale Price Range

Similar Upcoming Sales

8.92ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL (1 of 2)

8.92ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL

1 day Left

8.92ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL (1 of 2)

8.92ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL

Mar 01, 2026

2.95ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL (1 of 2)

2.95ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL

1 day Left

2.95ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL (1 of 2)

2.95ct LOOSE CABOCHON NATURAL AUSTRALIAN BOULDER OPAL

Mar 01, 2026

3.33 Ct Natural Black Fire Opal Oval Cab (1 of 3)

3.33 Ct Natural Black Fire Opal Oval Cab

5 days Left

Natural Multi Color Opal Flashing Boulder 19.77 Ct. Free Form Cabochon Gemstone From Australia (1 of 3)

Natural Multi Color Opal Flashing Boulder 19.77 Ct. Free Form Cabochon Gemstone From Australia

Treasure of Gems & Jewelry

Feb 08, 2026

4.00 Ct Natural Black Flashing Fire Opal Oval Cab (1 of 3)

4.00 Ct Natural Black Flashing Fire Opal Oval Cab

Feb 18, 2026

1.53 Ct Natural Black Flashing Fire Opal Oval Cab (1 of 2)

1.53 Ct Natural Black Flashing Fire Opal Oval Cab

Feb 16, 2026

2.63 Ct Natural Black Flashing Fire Opal Oval Cab (1 of 3)

2.63 Ct Natural Black Flashing Fire Opal Oval Cab

Feb 09, 2026

1.86 Ct Natural Black Flashing Fire Opal Oval Cab (1 of 2)

1.86 Ct Natural Black Flashing Fire Opal Oval Cab

3 days Left

1.51Ct Welo Black Opal Polished - Ethiopian Opal (1 of 7)

1.51Ct Welo Black Opal Polished - Ethiopian Opal

Ksmith Heritage Auctioneers

Jul 26, 2025

2.90 Ct Natural Black Fire Opal Cushion Cut (1 of 3)

2.90 Ct Natural Black Fire Opal Cushion Cut

5 days Left

2.53Ct Welo Black Opal Faceted Polished - Ethiopian Opal (1 of 6)

2.53Ct Welo Black Opal Faceted Polished - Ethiopian Opal

Ksmith Heritage Auctioneers

Jul 27, 2025

2.26 Ct Natural Black Flashing Fire Opal Oval Cut (1 of 2)

2.26 Ct Natural Black Flashing Fire Opal Oval Cut

Feb 09, 2026

1.69 Ct Natural Black Flashing Fire Opal Oval Cab (1 of 2)

1.69 Ct Natural Black Flashing Fire Opal Oval Cab

Feb 09, 2026

Natural Multi-Color Opal 2.27 Ct. Oval Cabochon Shape 10.7 x 7.5 Mm. Gemstone Unheated (1 of 3)

Natural Multi-Color Opal 2.27 Ct. Oval Cabochon Shape 10.7 x 7.5 Mm. Gemstone Unheated

Treasure of Gems & Jewelry

Feb 08, 2026

Similar Sale History

Unlock All Prices

Sold

3.55 ct Australian Boulder Opal (1 of 5)

3.55 ct Australian Boulder Opal Item: 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 that

Sold

5.92 ct Australian Boulder Opal (1 of 4)

5.92 ct Australian Boulder Opal Item: 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 adva

Sold

22.92 ct Australian Boulder Opal Gemstone Cabochon (1 of 4)

22.92 ct Australian Boulder Opal Gemstone Cabochon 22.92 ct Boulder Opal cabochon. 28 x 18mm. Queensland Australia origin gemstone. Perfect shape & size for a lovely pendant.

Sold

10.74 ct Australian Boulder Opal (1 of 3)

10.74 ct Australian Boulder Opal Title: 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 a

Sold

10.45 ct Australian Boulder Opal (1 of 4)

10.45 ct Australian Boulder Opal Title: 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 starts

Sold

9.81 ct Australian Boulder Opal (1 of 4)

9.81 ct Australian Boulder Opal Item: 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 collect

Sold

22.9 ct Australian Boulder Opal (1 of 3)

22.9 ct Australian Boulder Opal Title: 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 $1

Sold

7.28 ct Australian Boulder Opal (1 of 4)

7.28 ct Australian Boulder Opal Item: 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 that

Sold

26.03 ct Australian Boulder Opal (1 of 4)

26.03 ct Australian Boulder Opal Item: 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: This

Sold

10.04 ct Australian Boulder Opal (1 of 4)

10.04 ct Australian Boulder Opal Item: 10.04 ct Australian Boulder Opal Gemstones: Opal Carat Weights: 10.04 Size/Dimensions: 17.9 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 col

Sold

Ct Natural Loose Australian Koroit Yowah Boulder Opal Cabochon (1 of 3)

Ct Natural Loose Australian Koroit Yowah Boulder Opal Cabochon 17x13x4mm Weight: 6 Carat

Sold

Ct Natural Loose Australian Koroit Yowah Boulder Opal Cabochon (1 of 3)

Ct Natural Loose Australian Koroit Yowah Boulder Opal Cabochon 12x9x6mm Weight: 7 Carat

Sold

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette (1 of 3)

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette Dimension: 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 specim

Sold

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette (1 of 3)

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette Dimension: 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 sp

Sold

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette (1 of 2)

Australian Boulder Opal Rough: Mesmerizing Spectrum of Nature's Palette Dimension: 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 spec

Sold

310 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough (1 of 2)

310 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough Dimension: 13 TO 25 mm

Sold

48 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough (1 of 2)

48 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough Dimension: 17 to 24 mm

Sold

8.8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon (1 of 3)

8.8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon Dimension: 18 x 13 x 4 mm

Sold

147 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough (1 of 4)

147 Ct Koroit Boulder Opal Rough - Australian Opal - Freeform Rough Dimension: 45 x 25 mm

Sold

7.9 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon (1 of 3)

7.9 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon Dimension: 13 X 11 x 4 Cm

Sold

6.5 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon (1 of 3)

6.5 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon Dimension: 20 X 9 x 4 Cm

Sold

8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon (1 of 3)

8 Ct Koroit Boulder Opal Polished - Australian Opal - Freeform Cabochon Dimension: 21 X 15 x4 Cm

Sold

Australian koroit boulder opal-33.65 ct. (1 of 2)

Australian 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 destinat

Sold

Australian Koroit Matrix Boulder Opal: Vibrant Tapestry of Nature's Brilliance (1 of 3)

Australian Koroit Matrix Boulder Opal: Vibrant Tapestry of Nature's Brilliance Dimension: 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 au

TOP