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 |
6.38ct Multicolor Boulder Opal, Marquise, Opaque
21.1 x 9.7 mm
$ 53.59
9.86ct Multicolor Boulder Opal, Oval, Opaque
20.4 x 11.2 mm
$ 59.16
25.02ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 18.4 mm
$ 210.17
14.98ct Multicolor Boulder Opal, Cushion, Opaque
20.2 x 13.9 mm
$ 104.86
11.60ct Multicolor Boulder Opal, Fancy, Opaque
19.8 x 15.7 mm
$ 69.60
12.62ct Multicolor Boulder Opal, Cushion, Opaque
14 x 14 mm (calibrated)
$ 75.72
30.50ct Multicolor Boulder Opal, Pear Shape, Translucent
30 x 22 mm (calibrated)
$ 201.30
21.82ct Multicolor Boulder Opal, Cushion, Opaque
20.7 x 16.1 mm
$ 201.61
25.30ct Multicolor Boulder Opal, Oval, Opaque
29.7 x 13.5 mm
$ 212.52
40.55ct Multicolor Boulder Opal, Fancy, Opaque
26 x 23.1 mm
$ 243.30
41.37ct Multicolor Boulder Opal, Oval, Opaque
30 x 22 mm (calibrated)
$ 273.05
50.24ct Multicolor Boulder Opal, Oval, Opaque
32.3 x 24.3 mm
$ 301.44
58.43ct Multicolor Boulder Opal, Fancy, Opaque
35.6 x 29.1 mm
$ 350.58
63.70ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 29.3 mm
$ 382.20
64.32ct Multicolor Boulder Opal, Fancy, Opaque
42.5 x 26.1 mm
$ 385.92
15.88ct Multicolor Boulder Opal, Cushion, Opaque
23.1 x 12.2 mm
$ 133.39
20.55ct Multicolor Boulder Opal, Pear Shape, Opaque
31.9 x 16.1 mm
$ 135.64
75.33ct Multicolor Boulder Opal, Fancy, Opaque
43.5 x 29.6 mm
$ 451.98
27.89ct Multicolor Boulder Opal, Fancy, Opaque
25.7 x 23.1 mm
$ 167.34
33.35ct Multicolor Boulder Opal, Fancy, Opaque
46.8 x 19.5 mm
$ 200.10
16.76ct Multicolor Boulder Opal, Fancy, Opaque
29.1 x 12.2 mm
$ 100.56
21.73ct Multicolor Boulder Opal, Fancy, Opaque
25.7 x 20.3 mm
$ 130.38
17.56ct Multicolor Boulder Opal, Fancy, Opaque
24 x 16.7 mm
$ 105.36
21.08ct Multicolor Boulder Opal, Fancy, Opaque
20.9 x 19.9 mm
$ 126.48
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've purchased from here many times over the last decade+. I find the information easy to understand, helpful, and interesting. I have always been satisfied that I got exactly what I ordered. Pictures and descriptions are clear and unique to each stone.
Overall Rating -> 10
Great site for finding specific stones and sizes for individual pieces of jewelry
Overall Rating -> 10
Easy to use website
Overall Rating -> 10
My experience was done with ease
Overall Rating -> 9 
I was looking for a small gift for a friend- the process is the same as every other time and was very simple, and she even got her gift early! On the downside, there's no way to easily keep track of multiple Shipping Addresses, so if I want to send a gift to Friend A and to Friend B, I have to overwrite everything and it's a fair bit clunky in that regard.
Overall Rating -> 10
I have been very happy with my prior purchases and enjoy the website experience.
