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 |
11.00ct Multicolor Boulder Opal, Fancy, Opaque
22.3 x 11.5 mm
$ 54.78
6.10ct Multicolor Boulder Opal, Fancy, Transparent
17 x 11.5 mm
$ 30.38
14.15ct Multicolor Boulder Opal, Fancy, Opaque
17.9 x 14.9 mm
$ 70.47
12.95ct Multicolor Boulder Opal, Oval, Opaque
23.1 x 12.3 mm
$ 64.49
16.52ct Multicolor Boulder Opal, Cushion, Opaque
19 x 14.8 mm
$ 115.18
16.30ct Multicolor Boulder Opal, Cushion, Opaque
24.9 x 9.9 mm
$ 113.64
11.42ct Multicolor Boulder Opal, Fancy, Transparent
21.7 x 18.6 mm
$ 56.87
10.26ct Multicolor Boulder Opal, Fancy, Opaque
19.2 x 10.5 mm
$ 51.09
7.43ct Multicolor Boulder Opal, Oval, Opaque
23.9 x 8 mm
$ 51.80
10.15ct Multicolor Boulder Opal, Fancy, Opaque
18 x 13 mm (calibrated)
$ 70.77
13.28ct Multicolor Boulder Opal, Pear Shape, Opaque
26.7 x 13.9 mm
$ 66.13
11.57ct Multicolor Boulder Opal, Oval, Opaque
17.3 x 12.3 mm
$ 80.67
7.10ct Multicolor Boulder Opal, Oval, Opaque
21.2 x 10.1 mm
$ 49.50
15.09ct Multicolor Boulder Opal, Oval, Opaque
18.5 x 14.6 mm
$ 105.21
7.95ct Multicolor Boulder Opal, Oval, Opaque
18.3 x 9.9 mm
$ 55.43
16.10ct Multicolor Boulder Opal, Cushion, Opaque
22.3 x 12.7 mm
$ 112.25
14.55ct Multicolor Boulder Opal, Oval, Opaque
26.3 x 11.2 mm
$ 101.44
6.90ct Multicolor Boulder Opal, Pear Shape, Opaque
19 x 8.7 mm
$ 48.11
9.46ct Multicolor Boulder Opal, Pear Shape, Opaque
17.9 x 12 mm
$ 65.95
6.10ct Multicolor Boulder Opal, Pear Shape, Opaque
19.2 x 11.8 mm
$ 42.53
14.40ct Multicolor Boulder Opal, Cushion, Translucent
18.4 x 16.2 mm
$ 100.40
20.61ct Multicolor Boulder Opal, Oval, Opaque
31.9 x 12.2 mm
$ 102.64
8.11ct Multicolor Boulder Opal, Pear Shape, Opaque
21.1 x 11 mm
$ 56.54
8.32ct Multicolor Boulder Opal, Pear Shape, Opaque
18.8 x 10.2 mm
$ 58.01
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 
Very neat and to the point
Overall Rating -> 10
The citrine gems are beautiful. I appreciated that each stone was individually shown on the website so I could see exactly what I was getting. No mystery person selecting random stones for me. The documentation included with each gem was high quality as well. Great price and arrived as expected.
Overall Rating -> 10
The website has a good selection, the interface is very intuitive.
Overall Rating -> 10
Very pleasant
Overall Rating -> 10
I was looking for high-quality amethyst on this site, and I was able to compare size, color, and weight in detail before making a purchase.
Overall Rating -> 9 
Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly
