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 |
8.30ct Multicolor Boulder Opal, Pear Shape, Opaque
19.3 x 11 mm
$ 63.65
10.43ct Multicolor Boulder Opal, Pear Shape, Opaque
20.1 x 13.6 mm
$ 79.99
21.39ct Multicolor Boulder Opal, Cushion, Opaque
16 x 16 mm (calibrated)
$ 164.04
13.78ct Multicolor Boulder Opal, Cushion, Translucent
19.2 x 13.2 mm
$ 105.68
4.31ct Multicolor Boulder Opal, Oval, Translucent
15.8 x 10 mm
$ 30.05
8.69ct Multicolor Boulder Opal, Pear Shape, Translucent
20 x 12.3 mm
$ 66.64
11.89ct Multicolor Boulder Opal, Fancy, Opaque
29.6 x 9.9 mm
$ 35.52
19.30ct Multicolor Boulder Opal, Fancy, Translucent
25.4 x 21.2 mm
$ 105.73
11.18ct Multicolor Boulder Opal, Pear Shape, Opaque
23.3 x 16.3 mm
$ 61.25
39.95ct Multicolor Boulder Opal, Sphere / Ball, Opaque
17.6 mm
$ 198.95
34.16ct Multicolor Boulder Opal, Oval, Opaque
23.4 x 19.6 mm
$ 262.36
13.21ct Multicolor Boulder Opal, Fancy, Opaque
14 x 14 mm (calibrated)
$ 101.31
7.81ct Multicolor Boulder Opal, Pear Shape, Opaque
16.4 x 10.5 mm
$ 59.90
23.34ct Multicolor Boulder Opal, Oval, Opaque
20.8 x 14 mm
$ 179.00
13.14ct Multicolor Boulder Opal, Oval, Opaque
19.5 x 13.5 mm
$ 100.78
19.83ct Multicolor Boulder Opal, Trillion, Opaque
22.8 x 21.2 mm
$ 65.18
10.04ct Multicolor Boulder Opal, Fancy, Opaque
15.2 x 12.1 mm
$ 77.00
21.32ct Multicolor Boulder Opal, Oval, Opaque
27.3 x 13.1 mm
$ 163.50
22.54ct Multicolor Boulder Opal, Oval, Opaque
24.8 x 20 mm
$ 172.86
22.67ct Multicolor Boulder Opal, Oval, Opaque
21.8 x 16.5 mm
$ 173.86
28.03ct Multicolor Boulder Opal, Pear Shape, Opaque
27 x 20 mm (calibrated)
$ 214.97
21.46ct Multicolor Boulder Opal, Pear Shape, Opaque
28.9 x 18.8 mm
$ 164.58
42.73ct Multicolor Boulder Opal, Oval, Opaque
27 x 20 mm (calibrated)
$ 327.70
26.23ct Multicolor Boulder Opal, Pear Shape, Opaque
23.2 x 17 mm
$ 201.16
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
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Overall Rating -> 10 
Great prices!!! High quality gemstones.
Overall Rating -> 10
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Very good place to buy gemstones
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Overall Rating -> 9 
Nothing bad to report. Everything is as expected. The gems and the price are all very good.
Overall Rating -> 10
The site provided lots of detail, factual data, and good photos. I also like the availability of searching by price range as well as by the type of stone.
