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Boulder Opal Gemstones

Discover natural boulder opal gemstones featuring vivid color play set in distinctive ironstone matrix.

Boulder Opal Weight
Boulder Opal Size
Boulder Opal Clarity
Boulder Opal Price

Size Explained

Choose Size or Size Range
For Example: 6-7
For Example: 8-9
Bi-color
Black
Blue
Brown
Golden
Gray
Green
Multicolor Boulder Opal
Orange
Pink
Purple
Red
Turquoise
Violet
White
Yellow
Single
Pairs
Lots
Faceted
Cabochons
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10.92ct Multicolor Boulder Opal, Fancy, Opaque

22.6 x 12.9 mm

$ 65.52

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22.81ct Multicolor Boulder Opal, Fancy, Opaque

29.2 x 16.4 mm

$ 136.86

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7.00ct Multicolor Boulder Opal, Fancy, Opaque

18.5 x 12.1 mm

$ 42.00

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10.71ct Multicolor Boulder Opal, Fancy, Opaque

24.8 x 15.2 mm

$ 64.26

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17.99ct Multicolor Boulder Opal, Fancy, Opaque

9.7 x 17.3 mm

$ 107.94

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40.81ct Multicolor Boulder Opal, Oval, Opaque

34.3 x 24.1 mm

$ 244.86

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5.11ct Multicolor Boulder Opal, Fancy, Opaque

12.3 x 10.7 mm

$ 30.66

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15.73ct Multicolor Boulder Opal, Pear Shape, Opaque

36.4 x 16.2 mm

$ 94.38

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9.18ct Multicolor Boulder Opal, Cushion, Opaque

16.7 x 9.6 mm

$ 55.08

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21.28ct Multicolor Boulder Opal, Fancy, Opaque

22.6 x 21.3 mm

$ 127.68

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16.59ct Multicolor Boulder Opal, Fancy, Opaque

29.3 x 14.7 mm

$ 99.54

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17.20ct Multicolor Boulder Opal, Pear Shape, Opaque

21.7 x 13.1 mm

$ 103.20

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42.56ct Multicolor Boulder Opal, Fancy, Opaque

36.1 x 31 mm

$ 255.36

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7.75ct Multicolor Boulder Opal, Fancy, Opaque

16 x 12 mm (calibrated)

$ 46.50

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10.68ct Multicolor Boulder Opal, Fancy, Opaque

20.1 x 16.5 mm

$ 64.08

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8.60ct Multicolor Boulder Opal, Fancy, Opaque

18 x 13 mm (calibrated)

$ 51.60

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16.75ct Multicolor Boulder Opal, Fancy, Opaque

26.6 x 15.3 mm

$ 100.50

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6.08ct Multicolor Boulder Opal, Oval, Opaque

16.1 x 9.9 mm

$ 36.48

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12.00ct Multicolor Boulder Opal, Fancy, Opaque

26 x 16.3 mm

$ 72.00

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40.27ct Multicolor Boulder Opal, Fancy, Opaque

41.4 x 24.3 mm

$ 241.62

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50.57ct Multicolor Boulder Opal, Fancy, Opaque

35.2 x 23.2 mm

$ 303.42

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45.10ct Multicolor Boulder Opal, Fancy, Opaque

41.1 x 26.7 mm

$ 270.60

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10.02ct Multicolor Boulder Opal, Oval, Opaque

20.8 x 14.2 mm

$ 60.12

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24.71ct Multicolor Boulder Opal, Oval, Opaque

42.2 x 16.8 mm

$ 148.26

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Why Buy Boulder Opal from GemSelect?

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.

Natural Boulder Opal Gemstones from Australia

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 star ratings

Took a chance on purchasing my gemstones from Gemselect and was impressed. 10/10

Posted By KT in September, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I can pick and choose from large selection and find just what I need for .y projects, currently my cane.

Posted By Darkstar731 in July, 2025
Source: Bizrate

Overall Rating -> 9 star ratings

Plan on purchasing on an ongoing basis. So far.....so good....

Posted By Jim in January, 2026
Source: Bizrate

Overall Rating -> 9 star ratings

I love the gems!

Posted By MM in April, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

I feel Gemselect is a trustworthy company to buy from

Posted By Becky in October, 2025
Source: Bizrate

Overall Rating -> 10 star ratings

Good. I ts very user friendly.

Posted By Shalini in June, 2025
Source: Bizrate
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