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 |
27.89ct Multicolor Boulder Opal, Fancy, Opaque
25.7 x 23.1 mm
$ 138.89
33.35ct Multicolor Boulder Opal, Fancy, Opaque
46.8 x 19.5 mm
$ 166.08
16.76ct Multicolor Boulder Opal, Fancy, Opaque
29.1 x 12.2 mm
$ 83.46
21.73ct Multicolor Boulder Opal, Fancy, Opaque
25.7 x 20.3 mm
$ 108.22
17.56ct Multicolor Boulder Opal, Fancy, Opaque
24 x 16.7 mm
$ 87.45
21.08ct Multicolor Boulder Opal, Fancy, Opaque
20.9 x 19.9 mm
$ 104.98
10.92ct Multicolor Boulder Opal, Fancy, Opaque
22.6 x 12.9 mm
$ 54.38
22.81ct Multicolor Boulder Opal, Fancy, Opaque
29.2 x 16.4 mm
$ 113.59
7.00ct Multicolor Boulder Opal, Fancy, Opaque
18.5 x 12.1 mm
$ 34.86
10.71ct Multicolor Boulder Opal, Fancy, Opaque
24.8 x 15.2 mm
$ 53.34
17.99ct Multicolor Boulder Opal, Fancy, Opaque
9.7 x 17.3 mm
$ 89.59
40.81ct Multicolor Boulder Opal, Oval, Opaque
34.3 x 24.1 mm
$ 203.23
5.11ct Multicolor Boulder Opal, Fancy, Opaque
12.3 x 10.7 mm
$ 25.45
15.73ct Multicolor Boulder Opal, Pear Shape, Opaque
36.4 x 16.2 mm
$ 78.34
9.18ct Multicolor Boulder Opal, Cushion, Opaque
16.7 x 9.6 mm
$ 45.72
21.28ct Multicolor Boulder Opal, Fancy, Opaque
22.6 x 21.3 mm
$ 105.97
16.59ct Multicolor Boulder Opal, Fancy, Opaque
29.3 x 14.7 mm
$ 82.62
17.20ct Multicolor Boulder Opal, Pear Shape, Opaque
21.7 x 13.1 mm
$ 85.66
42.56ct Multicolor Boulder Opal, Fancy, Opaque
36.1 x 31 mm
$ 211.95
7.75ct Multicolor Boulder Opal, Fancy, Opaque
16 x 12 mm (calibrated)
$ 38.60
10.68ct Multicolor Boulder Opal, Fancy, Opaque
20.1 x 16.5 mm
$ 53.19
8.60ct Multicolor Boulder Opal, Fancy, Opaque
18 x 13 mm (calibrated)
$ 42.83
16.75ct Multicolor Boulder Opal, Fancy, Opaque
26.6 x 15.3 mm
$ 83.42
6.08ct Multicolor Boulder Opal, Oval, Opaque
16.1 x 9.9 mm
$ 30.28
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 
Easy and good price
Overall Rating -> 10
Great selection. Maybe too great i kept adding and deleting stuff because i found better looking ones
Overall Rating -> 9 
I did not realize these stones were of jewelry quality. They are really beautiful, just not what I was expecting which was more of a natural stone.
Overall Rating -> 10
Absolutely love the website, selection and products. Can you guys add a gemstones with inclusions tab. I like those it'd be nice to have them all in one place but i do understand it would be alot of work to go through and categorize them. Thank you anyways
Overall Rating -> 9
It was great!
Overall Rating -> 9
Will know more once order received
