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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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 |
14.40ct Multicolor Boulder Opal, Cushion, Translucent
18.4 x 16.2 mm
$ 120.96
8.11ct Multicolor Boulder Opal, Pear Shape, Opaque
21.1 x 11 mm
$ 68.12
20.61ct Multicolor Boulder Opal, Oval, Opaque
31.9 x 12.2 mm
$ 123.66
8.32ct Multicolor Boulder Opal, Pear Shape, Opaque
18.8 x 10.2 mm
$ 69.89
7.30ct Multicolor Boulder Opal, Pear Shape, Opaque
15 x 9.5 mm
$ 61.32
7.48ct Multicolor Boulder Opal, Pear Shape, Opaque
16 x 12 mm (calibrated)
$ 62.83
12.50ct Multicolor Boulder Opal, Oval, Translucent
22.8 x 11.5 mm
$ 105.00
12.25ct Multicolor Boulder Opal, Fancy, Opaque
30.2 x 15.8 mm
$ 73.50
16.81ct Multicolor Boulder Opal, Fancy, Opaque
28.8 x 13.1 mm
$ 100.86
18.63ct Multicolor Boulder Opal, Fancy, Opaque
19.6 x 17.5 mm
$ 111.78
15.41ct Multicolor Boulder Opal, Oval, Opaque
20 x 15 mm (calibrated)
$ 92.46
22.64ct Multicolor Boulder Opal, Oval, Opaque
30.5 x 13.4 mm
$ 135.84
10.45ct Multicolor Boulder Opal, Cushion, Opaque
26.9 x 9.6 mm
$ 62.70
7.48ct Multicolor Boulder Opal, Oval, Opaque
19.1 x 10.9 mm
$ 44.88
18.42ct Multicolor Boulder Opal, Fancy, Opaque
22.4 x 14.5 mm
$ 110.52
24.07ct Multicolor Boulder Opal, Fancy, Opaque
22.2 x 18.7 mm
$ 144.42
17.61ct Multicolor Boulder Opal, Fancy, Opaque
22.8 x 17.7 mm
$ 105.66
7.58ct Multicolor Boulder Opal, Fancy, Opaque
18 x 9.2 mm
$ 45.48
17.73ct Multicolor Boulder Opal, Fancy, Opaque
23.7 x 15.3 mm
$ 106.38
14.37ct Multicolor Boulder Opal, Oval, Opaque
16.4 x 13.1 mm
$ 120.71
9.26ct Multicolor Boulder Opal, Fancy, Opaque
21.4 x 15.4 mm
$ 77.78
7.69ct Multicolor Boulder Opal, Oval, Opaque
16 x 12 mm (calibrated)
$ 64.60
7.17ct Multicolor Boulder Opal, Fancy, Opaque
22.5 x 8.7 mm
$ 60.23
8.42ct Multicolor Boulder Opal, Oval, Opaque
18.8 x 13.8 mm
$ 70.73
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 -> 9 
Nothing bad to report. Everything is as expected. The gems and the price are all very good.
Overall Rating -> 10 
this site is awesome. I was able to look at the products think about purchasing and come back and find the same products. With the amount of inventory gem select has. Its awesome to be able to filter the way that they allow you too.
Overall Rating -> 10
I needed a very specific color of tourmaline and Gem Select had it. I had to get the client to agree and then ordered the stone. It arrived better than pictured and we all were very happy.
Overall Rating -> 10
I could see the actual gem I was buying
Overall Rating -> 10
love the site, the experience and the products.
Overall Rating -> 10
Everything was great, website user friendly, quality amazing, communication amazing, delivery amazing, everything was as expected, they done what they said they would, overall experience was amazing.
