Boulder Opal Gemstones
Discover natural boulder opal gemstones featuring vivid color play set in distinctive ironstone matrix.
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Bi-color
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Black
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Blue
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Brown
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Golden
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Gray
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Green
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Multicolor Boulder Opal
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Orange
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Pink
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Purple
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Red
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Turquoise
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Violet
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White
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Yellow
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Single |
Pairs |
Lots |
Faceted |
Cabochons |
8.61ct Multicolor Boulder Opal, Fancy, Opaque
17.9 x 11.9 mm
$ 35.73
8.77ct Multicolor Boulder Opal, Fancy, Opaque
22.1 x 13.6 mm
$ 36.40
6.73ct Multicolor Boulder Opal, Oval, Opaque
18.2 x 11.7 mm
$ 27.93
6.91ct Multicolor Boulder Opal, Fancy, Opaque
19.3 x 10.7 mm
$ 28.68
17.98ct Multicolor Boulder Opal, Oval, Opaque
25 x 16.9 mm
$ 74.62
12.16ct Multicolor Boulder Opal, Fancy, Opaque
22.3 x 17.9 mm
$ 50.46
5.40ct Multicolor Boulder Opal, Oval, Opaque
16.4 x 10.3 mm
$ 22.41
13.99ct Multicolor Boulder Opal, Trillion, Opaque
20.3 x 17.8 mm
$ 58.06
8.33ct Multicolor Boulder Opal, Fancy, Opaque
17.9 x 11.7 mm
$ 34.57
3.16ct Multicolor Boulder Opal, Cushion, Opaque
9.7 x 7.6 mm
$ 13.11
9.69ct Multicolor Boulder Opal, Trillion, Opaque
14 x 14 mm (calibrated)
$ 40.21
17.39ct Multicolor Boulder Opal, Fancy, Translucent
23.5 x 16.7 mm
$ 72.17
10.20ct Multicolor Boulder Opal, Fancy, Opaque
20.9 x 13.5 mm
$ 42.33
3.11ct Multicolor Boulder Opal, Round, Opaque
9 mm (calibrated)
$ 12.91
11.09ct Multicolor Boulder Opal, Trillion, Translucent
20.3 x 16.2 mm
$ 46.02
5.70ct Multicolor Boulder Opal, Oval, Opaque
15 x 10 mm (calibrated)
$ 23.66
23.49ct Multicolor Boulder Opal, Fancy, Opaque
28.3 x 16.1 mm
$ 97.48
22.64ct Multicolor Boulder Opal, Oval, Opaque
23.1 x 17.6 mm
$ 93.96
8.90ct Multicolor Boulder Opal, Pear Shape, Opaque
21.5 x 13.3 mm
$ 36.94
9.91ct Multicolor Boulder Opal, Fancy, Opaque
16.1 x 13.4 mm
$ 41.13
16.35ct Multicolor Boulder Opal, Trillion, Translucent
23.8 x 15.4 mm
$ 67.85
21.20ct Multicolor Boulder Opal, Pear Shape, Opaque
25 x 18 mm (calibrated)
$ 162.59
8.58ct Multicolor Boulder Opal, Cushion, Opaque
15 x 10.9 mm
$ 59.82
11.73ct Multicolor Boulder Opal, Round, Translucent
19 mm (calibrated)
$ 81.78
Why Buy Boulder Opal from GemSelect?
- Trusted Worldwide Since 2003
- Supplying natural gemstones to jewelers and collectors in 120+ countries
- Verified natural gemstones
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- Secure checkout and insured worldwide delivery
- 30-day returns and satisfaction guarantee
Natural Boulder Opal Gemstones
Our natural boulder opal gemstones are sourced primarily from Australia and cut to preserve the stone’s natural ironstone backing and vibrant play of color.
Australian Boulder Opal Stones
Australian boulder opal is prized for its organic patterns, durability, and striking contrast between opal color and ironstone matrix, making each stone one of a kind.
Boulder Opal for Jewelry
Boulder opal is ideal for rings, pendants, and statement jewelry thanks to its natural backing, which provides added strength compared to many other opal types.
Loose Boulder Opal Stones
Buying loose boulder opal allows full creative freedom for custom jewelry designs, from freeform cabochons to polished statement pieces.
Boulder Opal Cabochons
Boulder opal is most commonly cut as cabochons to highlight its natural patterns and flowing color veins within the ironstone.
Unique Patterns and Color Play
Each boulder opal displays individual color flashes ranging from blue and green to fiery reds, often following natural seams within the host rock.
Wholesale Boulder Opal
We offer competitive pricing on boulder opal gemstones for jewelers, designers, and collectors seeking distinctive stones in larger quantities.
Learn more about opal varieties, properties, and care on our Opal Information Page.
FAQs
What is boulder opal?
Boulder opal is a natural opal found within ironstone, typically cut with part of the host rock attached to enhance durability and appearance.
Is boulder opal stronger than other opals?
Yes, the ironstone backing makes boulder opal more durable than many solid opals, making it well suited for everyday jewelry.
Are your boulder opals natural?
All our boulder opal gemstones are 100% natural. Any treatments, if present, are clearly disclosed.
Where does boulder opal come from?
Most boulder opal comes from Queensland, Australia, one of the world’s most important sources of this unique gemstone.
Is boulder opal good for rings?
Yes, boulder opal is a popular choice for rings due to its natural strength and striking appearance, especially in protective settings.
GemSelect Certified Store Reviews
GemSelect: Over 22 Years in the Gemstone Business! Thank you for trusting us with your purchase!
Overall Rating -> 10 
Loved the price and the quality and the certification options which is the main reason why I buy. The guarantee is also a great reason to use gem select.
Overall Rating -> 10
Found a beautiful opal at a great price. I was not disappointed when it arrived. Even better in person.
Overall Rating -> 10
Easy picking, fast checkout, secure shipping. Cana't ask for anything more than efficiency and a good price.
Overall Rating -> 7 
Easy, quick.
Overall Rating -> 10
Very pleasant
Overall Rating -> 10
Enjoy every moment
