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 |
5.70ct Multicolor Boulder Opal, Oval, Opaque
15 x 10 mm (calibrated)
$ 23.66
23.49ct Multicolor Boulder Opal, Fancy, Opaque
28.3 x 16.1 mm
$ 97.48
22.64ct Multicolor Boulder Opal, Oval, Opaque
23.1 x 17.6 mm
$ 93.96
8.90ct Multicolor Boulder Opal, Pear Shape, Opaque
21.5 x 13.3 mm
$ 36.94
9.91ct Multicolor Boulder Opal, Fancy, Opaque
16.1 x 13.4 mm
$ 41.13
16.35ct Multicolor Boulder Opal, Trillion, Translucent
23.8 x 15.4 mm
$ 67.85
21.20ct Multicolor Boulder Opal, Pear Shape, Opaque
25 x 18 mm (calibrated)
$ 162.59
8.58ct Multicolor Boulder Opal, Cushion, Opaque
15 x 10.9 mm
$ 59.82
11.73ct Multicolor Boulder Opal, Round, Translucent
19 mm (calibrated)
$ 81.78
14.46ct Multicolor Boulder Opal, Pear Shape, Opaque
23.6 x 13 mm
$ 79.22
13.59ct Multicolor Boulder Opal, Oval, Opaque
20 x 15 mm (calibrated)
$ 67.68
9.45ct Multicolor Boulder Opal, Fancy, Opaque
23.9 x 9.5 mm
$ 47.06
17.63ct Multicolor Boulder Opal, Fancy, Opaque
23.8 x 14.9 mm
$ 87.80
12.97ct Multicolor Boulder Opal, Fancy, Translucent
19.6 x 15.8 mm
$ 90.43
5.28ct Multicolor Boulder Opal, Trillion, Translucent
17.3 x 15.9 mm
$ 36.81
6.38ct Multicolor Boulder Opal, Marquise, Opaque
21.1 x 9.7 mm
$ 44.48
9.86ct Multicolor Boulder Opal, Oval, Opaque
20.4 x 11.2 mm
$ 49.10
25.02ct Multicolor Boulder Opal, Fancy, Opaque
29.5 x 18.4 mm
$ 174.44
14.98ct Multicolor Boulder Opal, Cushion, Opaque
20.2 x 13.9 mm
$ 87.03
11.60ct Multicolor Boulder Opal, Fancy, Opaque
19.8 x 15.7 mm
$ 57.77
12.62ct Multicolor Boulder Opal, Cushion, Opaque
14 x 14 mm (calibrated)
$ 62.85
30.50ct Multicolor Boulder Opal, Pear Shape, Translucent
30 x 22 mm (calibrated)
$ 167.08
21.82ct Multicolor Boulder Opal, Cushion, Opaque
20.7 x 16.1 mm
$ 167.34
40.55ct Multicolor Boulder Opal, Fancy, Opaque
26 x 23.1 mm
$ 201.94
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 
Although the stones are smaller than I thought, I really don't think in millimeters, they are perfect. I plan to put one into a ring and the other into a necklace. Ordering was easy, contact kept me aware of how shipping was going, and delivery was sooner than expected. The quality of stones I have ordered in the past and this recent order is outstanding and stones I will be proud to wear.
Overall Rating -> 9 
It was great!
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
I have a beautiful emerald I purchased from a company names gemselect and they are awesome! You should try them out?
Overall Rating -> 9
Very good and simple exchange
Overall Rating -> 10
I loved it! Extensive inventory, great prices, I definitely will be buying from here again!
