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 |
17.98ct Multicolor Boulder Opal, Oval, Opaque
25 x 16.9 mm
$ 74.62
16.76ct Multicolor Boulder Opal, Fancy, Opaque
29.1 x 12.2 mm
$ 83.46
12.62ct Multicolor Boulder Opal, Cushion, Opaque
14 x 14 mm (calibrated)
$ 62.85
25.02ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 18.4 mm
$ 174.44
13.03ct Multicolor Boulder Opal, Pear Shape, Opaque
22.4 x 13.3 mm
$ 64.89
17.61ct Multicolor Boulder Opal, Fancy, Opaque
22.8 x 17.7 mm
$ 87.70
10.04ct Multicolor Boulder Opal, Fancy, Opaque
15.2 x 12.1 mm
$ 77.00
10.45ct Multicolor Boulder Opal, Cushion, Opaque
26.9 x 9.6 mm
$ 52.04
9.50ct Multicolor Boulder Opal, Fancy, Opaque
18.2 x 14 mm
$ 47.31
16.83ct Multicolor Boulder Opal, Fancy, Opaque
23.2 x 16 mm
$ 83.81
6.73ct Multicolor Boulder Opal, Oval, Opaque
18.2 x 11.7 mm
$ 27.93
8.27ct Multicolor Boulder Opal, Fancy, Opaque
27.2 x 8.3 mm
$ 41.18
5.27ct Multicolor Boulder Opal, Fancy, Opaque
17.4 x 10.1 mm
$ 21.87
15.36ct Multicolor Boulder Opal, Oval, Opaque
20.5 x 13.3 mm
$ 63.74
21.08ct Multicolor Boulder Opal, Fancy, Opaque
20.9 x 19.9 mm
$ 104.98
22.64ct Multicolor Boulder Opal, Oval, Opaque
23.1 x 17.6 mm
$ 93.96
23.34ct Multicolor Boulder Opal, Oval, Opaque
20.8 x 14 mm
$ 179.00
7.13ct Multicolor Boulder Opal, Cushion, Transparent
13 x 13 mm (calibrated)
$ 85.31
11.60ct Multicolor Boulder Opal, Fancy, Opaque
19.8 x 15.7 mm
$ 57.77
8.11ct Multicolor Boulder Opal, Pear Shape, Opaque
21.1 x 11 mm
$ 56.54
12.72ct Multicolor Boulder Opal, Cushion, Opaque
24.2 x 9.7 mm
$ 63.35
50.57ct Multicolor Boulder Opal, Fancy, Opaque
35.2 x 23.2 mm
$ 251.84
12.53ct Multicolor Boulder Opal, Oval, Opaque
17.8 x 13.7 mm
$ 62.40
4.31ct Multicolor Boulder Opal, Oval, Translucent
15.8 x 10 mm
$ 30.05
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 
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.
Overall Rating -> 10
Gem Select has a user friendly website and the product is very good as is the price. The gems are described accurately and I always get what I think I'm getting.
Overall Rating -> 7 
easy interface for a pricless buy
Overall Rating -> 10
Navigating the site was very easy and the photos of the exact gem you would be purchasing was well done.
Overall Rating -> 10
Good. I ts very user friendly.
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.
