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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

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

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

5 hrs Left

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

Est. $60-$120

Australian Boulder Opal and Diamond Pendant in 14k Yellow Gold: In 14k Yellow Gold. Contains one 21x13mm high quality natural doublet Australian Boulder Opal gemstone with excellent play of color. Also contains four high quality 1/2pt diamonds. 1 1/4 inch long (in

23 hrs Left

Australian Boulder Opal and Diamond Pendant in 14k Yellow Gold

Eric's Estate & Jewelry

Est. $2,387-$3,580

Australian Boulder Opal and Diamond Pendant in 14k Yellow Gold: In 14k Yellow Gold. Contains one 21x13mm high quality natural doublet Australian Boulder Opal gemstone with excellent play of color. Also contains four high quality 1/2pt diamonds. 1 1/4 inch long (in

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Australian Boulder Opal and Diamond Pendant in 14k Yellow Gold

Eric's Estate & Jewelry

Est. $2,387-$3,580

17.81 Carats Deep Blue and Brown Matrix Boulder Opal Cabochon - Natural Australian Stone, 41XM: This substantial boulder opal cabochon features a dramatic, layered composition of deep blue opal interwoven with rich brown and maroon ironstone matrix, accented by milky white opal veins that flow a

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17.81 Carats Deep Blue and Brown Matrix Boulder Opal Cabochon - Natural Australian Stone, 41XM

Est. $80-$160

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

5 hrs Left

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

Est. $60-$120

7.13 Carats Multicolor Iridescent Boulder Opal Cabochon - Natural Australian Stone, 50XM: This striking boulder opal cabochon features an elongated, tapered form with a rich brown ironstone matrix interspersed with vibrant, iridescent opal inclusions. The stone's polished surface showcases

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7.13 Carats Multicolor Iridescent Boulder Opal Cabochon - Natural Australian Stone, 50XM

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

5 hrs Left

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

Est. $60-$120

5.82 Carats Soft Blue and Iridescent Green Boulder Opal Cabochon - Natural Australian Stone, 46XM: This striking boulder opal cabochon features a smooth, triangular form with a rich brown ironstone matrix framing a luminous core of soft blue opal, accented by delicate iridescent green and golden fl

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5.82 Carats Soft Blue and Iridescent Green Boulder Opal Cabochon - Natural Australian Stone, 46XM

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

5 hrs Left

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

Est. $60-$120

17.32 Carats Winton Boulder Opal Rough - Natural Australian Stone, 37XP: This substantial Winton boulder opal rough showcases a striking band of ethereal sky-blue and aqua-green play-of-color, nestled within its natural ironstone host rock. Measuring precisely at 29.3 x 11

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17.32 Carats Winton Boulder Opal Rough - Natural Australian Stone, 37XP

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

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

Est. $60-$120

21.04 Carats Winton Boulder Opal Rough Slice - Natural Australian Stone, 43XP: This substantial Winton boulder opal rough slice showcases a striking horizontal band of vivid sky-blue and cerulean play-of-color, nestled within its natural ironstone host rock. Measuring precisely

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21.04 Carats Winton Boulder Opal Rough Slice - Natural Australian Stone, 43XP

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

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

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

5 hrs Left

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

Est. $60-$120

6.68 Carats Cream-Blue Boulder Opal with Dark Matrix - Natural Australian Stone, 36XM: This substantial boulder opal presents a striking visual narrative, with a creamy, pale base that transitions into soft, iridescent blue opal layers, all dramatically framed by a large, dark, textured

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6.68 Carats Cream-Blue Boulder Opal with Dark Matrix - Natural Australian Stone, 36XM

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

Platinum Pendant Necklace with Boulder Opal and Diamond Accents Adjustable Chain: Platinum Pendant Necklace with Boulder Opal and Diamond Accents Adjustable Chain This elegant necklace features a free form natural boulder opal pendant accented with numerous natural round brilliant

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Platinum Pendant Necklace with Boulder Opal and Diamond Accents Adjustable Chain

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

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

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

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

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

Est. $60-$120

23.95 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 36XP: This striking Winton boulder opal rough slab showcases a luminous band of ethereal sky-blue and pale aqua play-of-color, nestled within its natural ironstone host rock. Measuring precisely at 27.6 x 1

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23.95 Carats Winton Boulder Opal Rough Slab - Natural Australian Stone, 36XP

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

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

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

5 hrs Left

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

Est. $60-$120

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