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 |
34.16ct Multicolor Boulder Opal, Oval, Opaque
23.4 x 19.6 mm
$ 262.36
30.94ct Multicolor Boulder Opal, Fancy, Opaque
25.4 x 20.1 mm
$ 169.49
21.16ct Multicolor Boulder Opal, Fancy, Opaque
25.6 x 16.9 mm
$ 105.38
20.80ct Multicolor Boulder Opal, Fancy, Opaque
32.3 x 16.8 mm
$ 113.94
15.88ct Multicolor Boulder Opal, Cushion, Opaque
23.1 x 12.2 mm
$ 110.71
19.94ct Multicolor Boulder Opal, Marquise, Opaque
36.4 x 16.3 mm
$ 109.23
20.10ct Multicolor Boulder Opal, Cushion, Opaque
21.1 x 16.6 mm
$ 100.10
33.71ct Multicolor Boulder Opal, Fancy, Opaque
32.6 x 22.1 mm
$ 184.67
21.82ct Multicolor Boulder Opal, Cushion, Opaque
20.7 x 16.1 mm
$ 167.34
42.73ct Multicolor Boulder Opal, Oval, Opaque
27 x 20 mm (calibrated)
$ 327.70
20.55ct Multicolor Boulder Opal, Pear Shape, Opaque
31.9 x 16.1 mm
$ 112.58
17.03ct Multicolor Boulder Opal, Fancy, Opaque
26.9 x 13.5 mm
$ 93.29
16.81ct Multicolor Boulder Opal, Fancy, Opaque
28.8 x 13.1 mm
$ 83.71
35.99ct Multicolor Boulder Opal, Fancy, Opaque
45 x 23.8 mm
$ 107.53
21.39ct Multicolor Boulder Opal, Cushion, Opaque
16 x 16 mm (calibrated)
$ 164.04
30.50ct Multicolor Boulder Opal, Pear Shape, Translucent
30 x 22 mm (calibrated)
$ 167.08
14.98ct Multicolor Boulder Opal, Cushion, Opaque
20.2 x 13.9 mm
$ 87.03
41.37ct Multicolor Boulder Opal, Oval, Opaque
30 x 22 mm (calibrated)
$ 226.63
5.79ct Multicolor Boulder Opal, Fancy, Opaque
18.6 x 9 mm
$ 24.03
36.66ct Multicolor Boulder Opal, Oval, Opaque
39.1 x 16.4 mm
$ 200.83
11.61ct Multicolor Boulder Opal, Fancy, Opaque
18.8 x 12.3 mm
$ 34.69
10.36ct Multicolor Boulder Opal, Fancy, Translucent
19.6 x 11.4 mm
$ 51.59
9.73ct Multicolor Boulder Opal, Fancy, Opaque
16 x 12 mm (calibrated)
$ 48.46
8.60ct Multicolor Boulder Opal, Pear Shape, Opaque
18.9 x 12.5 mm
$ 65.95
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 
Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly
Overall Rating -> 10 
It was all good
Overall Rating -> 10
Web site is very simple to navigate Selection is terrific
Overall Rating -> 9
They have literally everything on this website! The prices are also pretty good, I was able to find plenty of nice stones that I could afford!
Overall Rating -> 10
All these questions, and I don't have to give any blood. What a Deal... I absolutely enjoy the Gem Select emails every month. This one today was special. I always say, I'll know it when I see it. This stone today was the One. Odd and Intriguing. Thank You So Much for all that you do.
Overall Rating -> 10
I found the filter options excellent. Yours was the third site I visited (asked chat got for reputable online sellers of loose gems) and the first I purchased from as I was able to easily find what I was looking for.
