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 |
5.44ct Multicolor Boulder Opal, Fancy, Opaque
15 x 9.3 mm
$ 22.58
39.95ct Multicolor Boulder Opal, Sphere / Ball, Opaque
17.6 mm
$ 198.95
2.86ct Multicolor Boulder Opal, Oval, Opaque
13.6 x 7.3 mm
$ 11.87
4.57ct Multicolor Boulder Opal, Cushion, Opaque
18.9 x 9.1 mm
$ 18.97
23.45ct Multicolor Boulder Opal, Fancy, Opaque
21.7 x 17.9 mm
$ 116.78
12.31ct Multicolor Boulder Opal, Oval, Opaque
25.9 x 17.1 mm
$ 61.30
54.71ct Multicolor Boulder Opal, Oval, Opaque
27.3 x 23.3 mm
$ 419.58
63.70ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 29.3 mm
$ 317.23
9.26ct Multicolor Boulder Opal, Fancy, Opaque
21.4 x 15.4 mm
$ 64.56
8.77ct Multicolor Boulder Opal, Fancy, Opaque
22.1 x 13.6 mm
$ 36.40
7.72ct Multicolor Boulder Opal, Fancy, Opaque
22.4 x 13.4 mm
$ 32.04
5.29ct Multicolor Boulder Opal, Fancy, Opaque
17.4 x 12.2 mm
$ 21.95
5.77ct Multicolor Boulder Opal, Fancy, Translucent
18.1 x 11.1 mm
$ 28.73
14.55ct Multicolor Boulder Opal, Oval, Opaque
26.3 x 11.2 mm
$ 101.44
22.64ct Multicolor Boulder Opal, Oval, Opaque
30.5 x 13.4 mm
$ 112.75
8.33ct Multicolor Boulder Opal, Fancy, Opaque
17.9 x 11.7 mm
$ 34.57
20.13ct Multicolor Boulder Opal, Fancy, Opaque
28.4 x 17.1 mm
$ 110.27
16.01ct Multicolor Boulder Opal, Fancy, Opaque
30.6 x 12.4 mm
$ 87.71
13.59ct Multicolor Boulder Opal, Oval, Opaque
20 x 15 mm (calibrated)
$ 67.68
7.17ct Multicolor Boulder Opal, Fancy, Opaque
22.5 x 8.7 mm
$ 49.99
10.40ct Multicolor Boulder Opal, Fancy, Opaque
19.5 x 12.6 mm
$ 79.76
40.55ct Multicolor Boulder Opal, Fancy, Opaque
26 x 23.1 mm
$ 201.94
11.19ct Multicolor Boulder Opal, Fancy, Opaque
18.2 x 14.8 mm
$ 55.73
17.98ct Multicolor Boulder Opal, Oval, Opaque
25 x 16.9 mm
$ 74.62
Why Buy Boulder Opal from GemSelect?
- Trusted Worldwide Since 2003
- Supplying natural gemstones to jewelers and collectors in 120+ countries
- Verified natural gemstones
- View All GemSelect Reviews on Bizrate
- 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 
I liked the selection of gems, and price. I did not like your PayPal process. I already have a PP account and you want me to sign up for another.
Overall Rating -> 1
Had to get here via the Facebook page. Googling direct brought up an error message.
Overall Rating -> 10
I had a very easy time navigating the web page and using filters to find what I was looking for. The varied selection was nice to see and pricing is clear and fair.
Overall Rating -> 10
On the clarity options it goes "and better" so if youre looking for si specifically and you click si and better it still shows you basically everything. It just removes the opaques. Itd be nice if it was vs only, vss only, si only, etc
Overall Rating -> 10
It was good. There was a large selection at prices I could afford.
Overall Rating -> 9 
It was great!
