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12.74Ct Boulder Opal - Australian Opal , 913E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 12.74Ct Dimension: 20.2x17.1x3.6 mm Treatment: Natural Untreated Type: Cabochon,

1 day Left

12.74Ct Boulder Opal - Australian Opal , 913E

Ksmith Heritage Auctioneers

Est. $110-$220

Natural Multi Color Flashing Boulder Opal 19.77 Ct. Free Form Cabochon Shape 32 x 17 Mm Gemstone: Product ID: 818727181 Product Name: Natural Opal Weight: 19.77 CT. Size: 32 x 17 x 5 MM. Shape: Free Form Cabochon Color: Multi-Color Clarity:Opaque Luster: Iridescent Gems Origin: Queensland Australi

2 days Left

Natural Multi Color Flashing Boulder Opal 19.77 Ct. Free Form Cabochon Shape 32 x 17 Mm Gemstone

Treasure of Gems & Jewelry

Est. $227-$357

7.83Ct Boulder Opal - Australian Opal , 525E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 7.83Ct Dimension: 18.7x15.2x2.9 mm Treatment: Natural Untreated Type: Cabochon, P

2 days Left

7.83Ct Boulder Opal - Australian Opal , 525E

Ksmith Heritage Auctioneers

Est. $110-$220

6.75Ct Koroit Matrix Boulder Opal Polished - Australian Opal - Oval Cabochon , 125E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 6.75Ct Dimension: 14.4 x 12.4 x 3.9 mm Treatment: Natural Untreated Shape: Oval

5 hrs Left

6.75Ct Koroit Matrix Boulder Opal Polished - Australian Opal - Oval Cabochon , 125E

Ksmith Heritage Auctioneers

Est. $90-$180

*10.22Ct Boulder Opal Set - Australian Opal , 1214E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 10.22Ct Dimension: 13.5x9.4x4.1 mm Treatment: Natural Untreated Type: Cabochon, P

5 hrs Left

*10.22Ct Boulder Opal Set - Australian Opal , 1214E

Ksmith Heritage Auctioneers

Est. $70-$140

13.41Ct Boulder Opal - Australian Opal , 225E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 13.41Ct Dimension: 25.3x19.4x2.9 mm Treatment: Natural Untreated Type: Cabochon,

5 hrs Left

13.41Ct Boulder Opal - Australian Opal , 225E

Ksmith Heritage Auctioneers

Est. $110-$220

16.04Ct Boulder Opal - Australian Opal, 738B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 16.04Ct Dimension: 27x17.2x3.3 mm Treatment: Natural Untreated Type: Cabochon, Polishe

1 day Left

16.04Ct Boulder Opal - Australian Opal, 738B

Ksmith Heritage Auctioneers

Est. $130-$260

10.08Ct Boulder Opal - Australian Opal , 539E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 10.08Ct Dimension: 24.7x14x3.2 mm Treatment: Natural Untreated Type: Cabochon, Po

2 days Left

10.08Ct Boulder Opal - Australian Opal , 539E

Ksmith Heritage Auctioneers

Est. $110-$220

7.57Ct Boulder Opal - Australian Opal , 516E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 7.57Ct Dimension: 14.8x8.6x3 mm Treatment: Natural Untreated Type: Cabochon, Poli

2 days Left

7.57Ct Boulder Opal - Australian Opal , 516E

Ksmith Heritage Auctioneers

Est. $110-$220

*7.43Ct Boulder Opal - Australian Opal , 21E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 7.43Ct Dimension: 16.7x12.9x3.9 mm Treatment: Natural Untreated Type: Cabochon, P

1 day Left

*7.43Ct Boulder Opal - Australian Opal , 21E

Ksmith Heritage Auctioneers

Est. $110-$220

10.16Ct Boulder Opal - Australian Opal, 737B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 10.16Ct Dimension: 20x16x3.4 mm Treatment: Natural Untreated Type: Cabochon, Polished<

1 day Left

10.16Ct Boulder Opal - Australian Opal, 737B

Ksmith Heritage Auctioneers

Est. $90-$180

26Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 116B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 26Ct Dimension: 31 x 13 x 7 mm Treatment: Natural Untreated Shape: Freeform Type

5 hrs Left

26Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 116B

Ksmith Heritage Auctioneers

Est. $70-$140

*11.03Ct Boulder Opal Set - Australian Opal , 220E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 11.03Ct Dimension: 12.3x8.3x4.2 mm Treatment: Natural Untreated Type: Cabochon, P

5 hrs Left

*11.03Ct Boulder Opal Set - Australian Opal , 220E

Ksmith Heritage Auctioneers

Est. $50-$100

1.74Ct Boulder Opal - Australian Opal , 373E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 1.74Ct Dimension: 9.2x6.5x3.2 mm Treatment: Natural Untreated Type: Cabochon, Pol

2 days Left

1.74Ct Boulder Opal - Australian Opal , 373E

Ksmith Heritage Auctioneers

Est. $90-$180

3.82 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.5mm, 7XM: This exceptional 3.82-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dense, intricate matrix of swirling chocolate-brown and deep plum ironstone, interwoven with v

1 hr Left

3.82 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.5mm, 7XM

Est. $60-$120

11.46Ct Blue Boulder Opal - Australian Opal , 231E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 11.46Ct Dimension: 16.3x15.7x5 mm Treatment: Natural Untreated Type: Cabochon, Po

5 hrs Left

11.46Ct Blue Boulder Opal - Australian Opal , 231E

Ksmith Heritage Auctioneers

Est. $90-$180

40Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 1087B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 40Ct Dimension: 36 x 16 x 7 mm Treatment: Natural Untreated Shape: Freeform Type

2 days Left

40Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 1087B

Ksmith Heritage Auctioneers

Est. $130-$260

3.66 Carats Cream-Blue Boulder Opal - Natural Australian Stone, 48XM: This elegant boulder opal captivates with a soft, creamy base that transitions into cool, translucent blue layers, with subtle flashes of iridescent green and violet shimmering beneath its smooth, tri

1 hr Left

3.66 Carats Cream-Blue Boulder Opal - Natural Australian Stone, 48XM

Est. $60-$120

11.90ct Winton Boulder Opal Rough - Multicolored Play-of-Color Specimen, 32XM: This 11.90ct Winton boulder opal rough, measuring 17x13mm, is a striking example of Australia's iconic gemstone, showcasing the raw beauty of nature's artistry. The specimen retains its natural ironst

1 hr Left

11.90ct Winton Boulder Opal Rough - Multicolored Play-of-Color Specimen, 32XM

Est. $60-$120

11.83 Carats Boulder Opal Cabochon - Intricate Matrix & Green Play-of-Color Specimen, 35XM: This 11.83ct boulder opal cabochon, measuring 26x12mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The elongated, freeform cabochon is poli

1 hr Left

11.83 Carats Boulder Opal Cabochon - Intricate Matrix & Green Play-of-Color Specimen, 35XM

Est. $60-$120

*5.90Ct Boulder Opal - Australian Opal , 460E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 5.90Ct Dimension: 20.1x11.1x3.4 mm Treatment: Natural Untreated Type: Cabochon, P

2 days Left

*5.90Ct Boulder Opal - Australian Opal , 460E

Ksmith Heritage Auctioneers

Est. $110-$220

*6.68Ct Yowah Boulder Opal - Australian Opal , 486E: Ksmith Heritage Auctioneers Subject: Natural Yowah Boulder Opal Origin: Australia Carat Weight: 6.68Ct Dimension: 18.3x13.1x4.1 mm Treatment: Natural Untreated Type: Caboc

2 days Left

*6.68Ct Yowah Boulder Opal - Australian Opal , 486E

Ksmith Heritage Auctioneers

Est. $110-$220

5.11 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.5mm, 13XM: This exceptional 5.11-carat Koroit boulder opal cabochon is a natural masterpiece, showcasing a dense, intricate tapestry of multicolored play-of-color set within a rich, earthy ironstone matrix. The

1 hr Left

5.11 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.5mm, 13XM

Est. $80-$160

13.52 Carats Soft Blue and Brown Matrix Boulder Opal Cabochon - Natural Australian Stone, 62XM: This substantial boulder opal cabochon features a rectangular form with a translucent, soft blue base infused with delicate iridescent undertones, set against a contrasting matrix of earthy brown and

1 hr Left

13.52 Carats Soft Blue and Brown Matrix Boulder Opal Cabochon - Natural Australian Stone, 62XM

Est. $60-$120

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