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 |
6.97ct Multicolor Boulder Opal, Cushion, Opaque
19.2 x 10.7 mm
$ 41.82
11.61ct Multicolor Boulder Opal, Fancy, Opaque
18.8 x 12.3 mm
$ 41.80
6.20ct Multicolor Boulder Opal, Oval, Opaque
22.9 x 7.6 mm
$ 52.08
11.24ct Multicolor Boulder Opal, Fancy, Opaque
16.7 x 13.8 mm
$ 67.44
13.60ct Multicolor Boulder Opal, Oval, Opaque
20 x 15 mm (calibrated)
$ 114.24
7.32ct Multicolor Boulder Opal, Oval, Opaque
14.4 x 10.5 mm
$ 43.92
13.03ct Multicolor Boulder Opal, Cushion, Opaque
20 x 15 mm (calibrated)
$ 86.00
11.51ct Multicolor Boulder Opal, Pear Shape, Opaque
26.8 x 14.6 mm
$ 69.06
18.28ct Multicolor Boulder Opal, Marquise, Opaque
36.2 x 14.4 mm
$ 120.65
12.53ct Multicolor Boulder Opal, Oval, Opaque
17.8 x 13.7 mm
$ 75.18
13.99ct Multicolor Boulder Opal, Fancy, Opaque
20.7 x 12.6 mm
$ 83.94
22.35ct Multicolor Boulder Opal, Fancy, Opaque
25.9 x 22 mm
$ 134.10
8.01ct Multicolor Boulder Opal, Cushion, Opaque
15.6 x 8.8 mm
$ 67.28
5.77ct Multicolor Boulder Opal, Fancy, Translucent
18.1 x 11.1 mm
$ 34.62
16.01ct Multicolor Boulder Opal, Fancy, Opaque
30.6 x 12.4 mm
$ 105.67
9.65ct Multicolor Boulder Opal, Marquise, Opaque
25.3 x 10.3 mm
$ 81.06
13.49ct Multicolor Boulder Opal, Oval, Opaque
19.8 x 13.9 mm
$ 124.64
4.62ct Multicolor Boulder Opal, Oval, Opaque
14 x 9 mm (calibrated)
$ 23.10
5.44ct Multicolor Boulder Opal, Fancy, Opaque
15 x 9.3 mm
$ 27.20
3.94ct Multicolor Boulder Opal, Oval, Opaque
12.1 x 8.4 mm
$ 19.70
3.70ct Multicolor Boulder Opal, Fancy, Opaque
13.1 x 12.3 mm
$ 18.50
3.94ct Multicolor Boulder Opal, Fancy, Opaque
13.7 x 10.6 mm
$ 19.70
3.54ct Multicolor Boulder Opal, Fancy, Opaque
14.7 x 9 mm
$ 17.70
2.86ct Multicolor Boulder Opal, Oval, Opaque
13.6 x 7.3 mm
$ 14.30
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 
excellent deals-excellent service-fair prices
Overall Rating -> 10
I have shopped at Gemselect for nearly 20 years. I especially like that you see pictures of the exact gem you are purchasing. You are a trusted source.
Overall Rating -> 9 
Always a good quality stone. Priced fairly and shipped promptly. Answers emails quickly
Overall Rating -> 10
easy site to navigate
Overall Rating -> 9
the gems were smaller than I thought but I was at fault for not reading the complete discrimination
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.
