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10.56 Carats Brown Matrix and Violet Vein Yowah Opal Cabochon - Natural Australian Stone, 45XM: This striking Yowah opal cabochon features a smooth, oval form with a rich brown ironstone matrix crisscrossed by delicate, iridescent violet veins of opal. The stone's polished surface enhances the c

4 days Left

10.56 Carats Brown Matrix and Violet Vein Yowah Opal Cabochon - Natural Australian Stone, 45XM

Est. $60-$120

2.73 Carats Koroit Yowah Opal Cabochon - Natural Australian Single Stone, 86XL: This distinctive Koroit Yowah opal cabochon, measuring 12.9x9.5mm, features a striking, fragmented ironstone matrix in deep brown and black, interspersed with broad, milky-blue opal veins. A single, l

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2.73 Carats Koroit Yowah Opal Cabochon - Natural Australian Single Stone, 86XL

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

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

Est. $80-$160

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

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

Est. $60-$120

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

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

Est. $60-$120

22.48 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 44XP: This elegant Winton boulder opal rough slab showcases a luminous band of soft sky-blue and pale lavender play-of-color, with subtle hints of violet iridescence that glow gently under light. Measuring

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22.48 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 44XP

Est. $60-$120

12.80 Carats Iridescent Sky Blue Winton Opal Rough - Natural Australian Specimen 18x11mm, 80XM: This exceptional rough opal from Winton, Australia, captivates with a vivid play of color, where intense flashes of sky blue and subtle turquoise swirl through a milky, translucent base. The natural,

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12.80 Carats Iridescent Sky Blue Winton Opal Rough - Natural Australian Specimen 18x11mm, 80XM

Est. $40-$80

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

4 days 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

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

Est. $80-$160

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

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

Est. $80-$160

5.01 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.2x9.6mm, 8XM: This exceptional 5.01-carat Koroit boulder opal cabochon is a natural geological masterpiece, featuring striking patches of milky blue opal infused with vivid iridescent play-of-color, set against a r

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5.01 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.2x9.6mm, 8XM

Est. $60-$120

4.15 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.9x9.9mm, 17XM: This exceptional 4.15-carat Koroit boulder opal cabochon is a natural masterpiece, showcasing a striking, organic formation of milky white and peach-toned opal, infused with a vivid spectrum of play-o

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4.15 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 13.9x9.9mm, 17XM

Est. $60-$120

3.08 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.3mm, 2XM: This captivating 3.08-carat Koroit boulder opal cabochon is a natural work of geological art, featuring delicate, scattered veins of vivid green, blue, and iridescent play-of-color that glow against a

4 days Left

3.08 Carats Koroit Boulder Opal Cabochon - Natural Australian Stones 12.8x9.3mm, 2XM

Est. $60-$120

5.45 Carats Boulder Opal Cabochon - Natural Matrix Vein Specimen, 61XM: This 5.45ct boulder opal cabochon, measuring 18x9mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The teardrop-shaped cabochon is polished t

4 days Left

5.45 Carats Boulder Opal Cabochon - Natural Matrix Vein Specimen, 61XM

Est. $60-$120

6.01 Carats Boulder Opal Cabochon - Natural Matrix & Play-of-Color Specimen, 39XM: This 6.01ct boulder opal cabochon, measuring 17x14mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The triangular cabochon is polished to a

4 days Left

6.01 Carats Boulder Opal Cabochon - Natural Matrix & Play-of-Color Specimen, 39XM

Est. $60-$120

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

4 days Left

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

Est. $60-$120

11.62 Carats Iridescent Blue-Green Winton Opal Rough - Natural Australian Specimen 22x10mm, 90XM: This exceptional rough opal from Winton, Australia, captivates with a vivid play of color, where intense flashes of electric green and deep celestial blue swirl through a milky, translucent base. The

4 days Left

11.62 Carats Iridescent Blue-Green Winton Opal Rough - Natural Australian Specimen 22x10mm, 90XM

Est. $60-$120

15.19ct Boulder Opal Cabochon - Banded Matrix & Play-of-Color Specimen, 34XM: This 15.19ct boulder opal cabochon, measuring 19x15mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The freeform cabochon is polished to a s

4 days Left

15.19ct Boulder Opal Cabochon - Banded Matrix & Play-of-Color Specimen, 34XM

Est. $60-$120

28.26 Carats Multicolor Iridescent Winton Opal Rough - Natural Australian Specimen 30x12mm, 82XM: This exceptional rough opal from Winton, Australia, captivates with a vivid play of color, where intense flashes of fiery orange, golden yellow, vibrant green, and deep blue swirl through a milky, tra

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28.26 Carats Multicolor Iridescent Winton Opal Rough - Natural Australian Specimen 30x12mm, 82XM

Est. $60-$120

28.80 Carats Winton Boulder Opal Rough Slab - Natural Australian Opal, 40XP: This impressive 28.80ct Winton boulder opal rough slab features a dramatic field of rich, velvety cobalt blue iridescence, with streaks of vivid indigo and hints of seafoam-green that glow intensely u

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28.80 Carats Winton Boulder Opal Rough Slab - Natural Australian Opal, 40XP

Est. $60-$120

2.15 Carats Boulder Opal Cabochon - Soft Pastel Play-of-Color Specimen, 60XM: This 2.15ct boulder opal cabochon, measuring 12x7mm, is a delicate example of Australia's iconic gemstone, showcasing the ethereal beauty of nature's artistry. The freeform triangular cabochon is poli

4 days Left

2.15 Carats Boulder Opal Cabochon - Soft Pastel Play-of-Color Specimen, 60XM

Est. $60-$120

3.08 Carats Boulder Opal Cabochon - Natural Matrix & Play-of-Color Specimen, 54XM: This 3.08ct boulder opal cabochon, measuring 10x9mm, is a striking example of Australia's iconic gemstone, showcasing the unique beauty of nature's artistry. The triangular cabochon is polished to a s

4 days Left

3.08 Carats Boulder Opal Cabochon - Natural Matrix & Play-of-Color Specimen, 54XM

Est. $60-$120

14.83ct Boulder Opal Cabochon - Soft Pastel Play-of-Color Specimen, 44XM: This 14.83ct boulder opal cabochon, measuring 24x16mm, is a striking example of Australia's iconic gemstone, showcasing the delicate beauty of nature's artistry. The freeform triangular cabochon is po

4 days Left

14.83ct Boulder Opal Cabochon - Soft Pastel Play-of-Color Specimen, 44XM

Est. $60-$120

3.44 Carats Boulder Opal Cabochon - Natural Matrix Inclusion Specimen, 51XM: This 3.44ct boulder opal cabochon, measuring 13x11mm, 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

4 days Left

3.44 Carats Boulder Opal Cabochon - Natural Matrix Inclusion Specimen, 51XM

Est. $60-$120

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