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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

3 hrs Left

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

Est. $60-$120

9.40Ct Boulder Opal - Australian Opal , 302E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 9.40Ct Dimension: 24.1x11.4x3.6 mm Treatment: Natural Untreated Type: Cabochon, P

2 days Left

9.40Ct Boulder Opal - Australian Opal , 302E

Ksmith Heritage Auctioneers

Est. $70-$140

Chinese shoushan stone fine carved boulder with peanuts on top: 3.8 inches height including wooden base.

Apr 06, 2026

Chinese shoushan stone fine carved boulder with peanuts on top

Lake Lanier Antiques LLC

Est. $160-$400

*2.90Ct Boulder Opal - Australian Opal, 850B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 2.90Ct Dimension: 10.3x9.2x3 mm Treatment: Natural Untreated Type: Cabochon, Polished<

1 day Left

*2.90Ct Boulder Opal - Australian Opal, 850B

Ksmith Heritage Auctioneers

Est. $70-$140

3.59Ct Boulder Opal Polished - Australian Opal - Oval Cabochon , 604E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 3.59Ct Dimension: 11 x 8 x 4 mm Treatment: Natural Untreated Shape: Oval Ty

2 days Left

3.59Ct Boulder Opal Polished - Australian Opal - Oval Cabochon , 604E

Ksmith Heritage Auctioneers

Est. $70-$140

A Lot of Fossilized Boulder Opal Rough Specimens, 61ZJ: This lot comprises six fossilized boulder opal rough specimens, ranging in size from 2.7 to 3.5 cm, with a total weight of 83.25 grams. Each specimen retains its natural ironstone host rock matrix, ex

3 hrs Left

A Lot of Fossilized Boulder Opal Rough Specimens, 61ZJ

Est. $40-$80

33Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 1071B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 33Ct Dimension: 22 x 13 x 9 mm Treatment: Natural Untreated Shape: Freeform Type

2 days Left

33Ct Winton Boulder Rough Opal - Australian Opal - Freeform Rough, 1071B

Ksmith Heritage Auctioneers

Est. $90-$180

*5.20Ct Boulder Opal - Australian Opal, 1143B: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 5.20Ct Dimension: 12.6x8.8x3.5 mm Treatment: Natural Untreated Type: Cabochon, Polishe

2 days Left

*5.20Ct Boulder Opal - Australian Opal, 1143B

Ksmith Heritage Auctioneers

Est. $70-$140

3.63 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.3x9.2mm, 10XM: This exceptional 3.63-carat Koroit boulder opal cabochon is a natural work of art, featuring vivid veins of electric blue and iridescent play-of-color that snake through a warm, earthy ironstone matri

3 hrs Left

3.63 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.3x9.2mm, 10XM

Est. $80-$160

1.99 Carats Iridescent Blue and Violet Boulder Opal Cabochon - Natural Australian Stone, 59XM: This striking boulder opal cabochon features a translucent, milky base infused with delicate iridescent flashes of blue and violet, set against a contrasting matrix of earthy brown and golden inclusio

3 hrs Left

1.99 Carats Iridescent Blue and Violet Boulder Opal Cabochon - Natural Australian Stone, 59XM

Est. $60-$120

38.40 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 45XP: This substantial Winton boulder opal rough slab showcases a captivating patchwork of ethereal sky-blue, aqua-green, and soft lavender play-of-color, embedded within its natural ironstone host rock. Me

3 hrs Left

38.40 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 45XP

Est. $80-$160

35.06 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 38XP: This impressive 35.06ct Winton boulder opal rough slab features a dynamic mosaic of luminous peacock blue and seafoam-green iridescence, interwoven with intricate ironstone matrix patterns. Measuring

3 hrs Left

35.06 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 38XP

Est. $80-$160

4.47 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 14.8x8.5mm, 5XM: This striking 4.47-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring delicate, branching veins of iridescent play-of-color that snake through a deep, chocolate-brown ir

3 hrs Left

4.47 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 14.8x8.5mm, 5XM

Est. $60-$120

4.28 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 15.8x10.5mm, 15XM: This magnificent 4.28-carat Koroit boulder opal cabochon is a breathtaking display of nature's artistry, defined by electrifying bands of neon green and royal blue play-of-color that swirl around a wa

3 hrs Left

4.28 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 15.8x10.5mm, 15XM

Est. $80-$160

29.01 Carats Winton Boulder Opal Rough Slab - Natural Australian Opion, 35XP: This striking 29.01ct Winton boulder opal rough slab boasts a mesmerizing blend of aquatic blue and seafoam-green iridescence, embedded within its natural ironstone matrix. Measuring a substantial 27

3 hrs Left

29.01 Carats Winton Boulder Opal Rough Slab - Natural Australian Opion, 35XP

Est. $80-$160

2.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.7x8.3mm, 6XM: This striking 2.52-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dense, intricate matrix of swirling chocolate-brown ironstone, interwoven with vivid veins of iri

3 hrs Left

2.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.7x8.3mm, 6XM

Est. $60-$120

9.98 Carats Boulder Opal Cabochon - Intricate Matrix Pattern Specimen, 64XM: This 9.98ct boulder opal cabochon, measuring 17x12mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The oval cabochon is polished to a smooth

3 hrs Left

9.98 Carats Boulder Opal Cabochon - Intricate Matrix Pattern Specimen, 64XM

Est. $80-$160

19.97 Carats Winton Boulder Opal Rough Specimen - Natural Australian Stone, 39XP: This exquisite Winton boulder opal rough specimen showcases a brilliant band of vivid sky-blue and periwinkle play-of-color, with subtle hints of lavender iridescence that glow softly under light. Mea

3 hrs Left

19.97 Carats Winton Boulder Opal Rough Specimen - Natural Australian Stone, 39XP

Est. $60-$120

10.84 Carats Iridescent Multicolor Boulder Opal - Natural Australian Stone, 52XM: This substantial boulder opal dazzles with a dynamic play of color, shifting through ethereal blues, violets, and subtle flashes of iridescent green and pink as light moves across its elongated, taper

3 hrs Left

10.84 Carats Iridescent Multicolor Boulder Opal - Natural Australian Stone, 52XM

Est. $60-$120

34.92 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 42XP: This striking Winton boulder opal rough slab showcases a vivid, iridescent patch of emerald-green and electric-blue play-of-color, set against a soft sky-blue opal base and encased in a rugged ironsto

3 hrs Left

34.92 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 42XP

Est. $80-$160

4.34 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.3mm, 4XM: This striking 4.34-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring a dramatic banded ironstone matrix with layered hues of deep plum, warm terracotta, and golden ochr

3 hrs Left

4.34 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.3x9.3mm, 4XM

Est. $60-$120

2.55 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.8x6.8mm, 9XM: This striking 2.55-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring vivid veins of iridescent play-of-color that snake through a rich, dark ironstone matrix. The elong

3 hrs Left

2.55 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 11.8x6.8mm, 9XM

Est. $60-$120

6.76Ct Boulder Opal - Australian Opal , 100E: Ksmith Heritage Auctioneers Subject: Natural Boulder Opal Origin: Australia Carat Weight: 6.76Ct Dimension: 16.8x12.6x4.3 mm Treatment: Natural Untreated Type: Cabochon, P

1 day Left

6.76Ct Boulder Opal - Australian Opal , 100E

Ksmith Heritage Auctioneers

Est. $30-$60

3.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.2x9.9mm, 19XM: This striking 3.52-carat Koroit boulder opal cabochon is a natural work of geological art, featuring vivid veins of electric blue and iridescent green play-of-color that snake through a rich, earthy i

3 hrs Left

3.52 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.2x9.9mm, 19XM

Est. $60-$120

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