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 |
7.81ct Multicolor Boulder Opal, Pear Shape, Opaque
16.4 x 10.5 mm
$ 59.90
6.97ct Multicolor Boulder Opal, Cushion, Opaque
19.2 x 10.7 mm
$ 34.71
22.54ct Multicolor Boulder Opal, Oval, Opaque
24.8 x 20 mm
$ 172.86
11.00ct Multicolor Boulder Opal, Fancy, Opaque
22.3 x 11.5 mm
$ 54.78
14.40ct Multicolor Boulder Opal, Cushion, Translucent
18.4 x 16.2 mm
$ 100.40
4.49ct Multicolor Boulder Opal, Pear Shape, Opaque
12.3 x 9.3 mm
$ 18.63
9.66ct Multicolor Boulder Opal, Oval, Opaque
22.4 x 13.1 mm
$ 52.92
6.20ct Multicolor Boulder Opal, Oval, Opaque
22.9 x 7.6 mm
$ 43.23
17.18ct Multicolor Boulder Opal, Fancy, Opaque
21.2 x 16.1 mm
$ 71.30
10.02ct Multicolor Boulder Opal, Oval, Opaque
20.8 x 14.2 mm
$ 49.90
3.11ct Multicolor Boulder Opal, Round, Opaque
9 mm (calibrated)
$ 12.91
10.38ct Multicolor Boulder Opal, Fancy, Opaque
17.8 x 13.6 mm
$ 43.08
17.39ct Multicolor Boulder Opal, Fancy, Translucent
23.5 x 16.7 mm
$ 72.17
5.70ct Multicolor Boulder Opal, Oval, Opaque
15 x 10 mm (calibrated)
$ 23.66
10.15ct Multicolor Boulder Opal, Fancy, Opaque
18 x 13 mm (calibrated)
$ 70.77
17.20ct Multicolor Boulder Opal, Pear Shape, Opaque
21.7 x 13.1 mm
$ 85.66
10.20ct Multicolor Boulder Opal, Fancy, Opaque
20.9 x 13.5 mm
$ 42.33
12.73ct Multicolor Boulder Opal, Trillion, Opaque
16 x 16 mm (calibrated)
$ 63.40
16.52ct Multicolor Boulder Opal, Cushion, Opaque
19 x 14.8 mm
$ 115.18
6.17ct Multicolor Boulder Opal, Trillion, Opaque
14 x 14 mm (calibrated)
$ 30.73
7.48ct Multicolor Boulder Opal, Oval, Opaque
19.1 x 10.9 mm
$ 37.25
10.97ct Multicolor Boulder Opal, Cushion, Opaque
17 x 11.4 mm
$ 54.63
42.56ct Multicolor Boulder Opal, Fancy, Opaque
36.1 x 31 mm
$ 211.95
13.14ct Multicolor Boulder Opal, Oval, Opaque
19.5 x 13.5 mm
$ 100.78
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 -> 8 
First time using this website. It was both exciting finding things in my price range and things Iam gonna save up for and use in other pieces. I love that the picture of the gem is the exact gem I'll be buying. I haven't tested the gems yes but they said they sold me 100% natural gems.
Overall Rating -> 9 
Will know more once order received
Overall Rating -> 10 
My experience was done with ease
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 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 -> 7 
easy interface for a pricless buy
