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 |
13.29ct Multicolor Boulder Opal, Fancy, Opaque
21.7 x 13.6 mm
$ 66.18
8.06ct Multicolor Boulder Opal, Oval, Opaque
16.8 x 11.8 mm
$ 61.81
12.38ct Multicolor Boulder Opal, Fancy, Translucent
25 x 18 mm (calibrated)
$ 61.65
10.36ct Multicolor Boulder Opal, Fancy, Translucent
19.6 x 11.4 mm
$ 51.59
12.73ct Multicolor Boulder Opal, Trillion, Opaque
16 x 16 mm (calibrated)
$ 63.40
9.35ct Multicolor Boulder Opal, Fancy, Opaque
17.6 x 14.2 mm
$ 46.56
35.99ct Multicolor Boulder Opal, Fancy, Opaque
45 x 23.8 mm
$ 107.53
14.28ct Multicolor Boulder Opal, Cushion, Opaque
23.2 x 11.1 mm
$ 109.52
8.27ct Multicolor Boulder Opal, Fancy, Opaque
27.2 x 8.3 mm
$ 41.18
33.93ct Multicolor Boulder Opal, Trillion, Opaque
26.7 x 21.3 mm
$ 223.57
9.41ct Multicolor Boulder Opal, Cushion, Opaque
13.7 x 10.9 mm
$ 46.86
21.16ct Multicolor Boulder Opal, Fancy, Opaque
25.6 x 16.9 mm
$ 105.38
16.25ct Multicolor Boulder Opal, Fancy, Opaque
29.7 x 15 mm
$ 80.93
10.30ct Multicolor Boulder Opal, Oval, Opaque
22.6 x 15.6 mm
$ 51.29
54.71ct Multicolor Boulder Opal, Oval, Opaque
27.3 x 23.3 mm
$ 419.58
32.39ct Multicolor Boulder Opal, Oval, Opaque
33.7 x 15 mm
$ 248.40
11.28ct Multicolor Boulder Opal, Cushion, Opaque
23.7 x 8.7 mm
$ 56.17
8.68ct Multicolor Boulder Opal, Fancy, Opaque
20 x 15 mm (calibrated)
$ 43.23
14.54ct Multicolor Boulder Opal, Fancy, Opaque
20 x 13.5 mm
$ 72.41
15.18ct Multicolor Boulder Opal, Fancy, Opaque
20.8 x 16.1 mm
$ 75.60
10.97ct Multicolor Boulder Opal, Cushion, Opaque
17 x 11.4 mm
$ 54.63
11.65ct Multicolor Boulder Opal, Round, Opaque
17 mm (calibrated)
$ 81.22
16.83ct Multicolor Boulder Opal, Fancy, Opaque
23.2 x 16 mm
$ 83.81
11.19ct Multicolor Boulder Opal, Fancy, Opaque
18.2 x 14.8 mm
$ 55.73
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 
Fast and reliable service.
Overall Rating -> 10 
Have made 2 purchases so far from GemSelect and they have been amazing! Anytime I requested additional info, videos or pictures of a particular item, the response was always timely and helpful. This is a great place to buy, if you are looking for loose stones. Highly recommend!
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 -> 10
I could see the actual gem I was buying
Overall Rating -> 10
They have a wonderful selection of gems of all sorts, shapes, cuts, and quality. I am very particular about the quality of stones I buy, and found many with VVS clarity and excellent cut and polish. I am thrilled with each of the stones I purchased, and would definitely recommend GemSelect to everyone.
Overall Rating -> 10
Absolutely love Gem Select. I always know the quality and accuracy of information and photos are top notch. Highly recommend!
