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Australian Boulder Opal for Sale, Natural Opals in Stock

Australian Boulder Opal for Sale | Natural Opals in Stock

We're proud to present our unique selection of natural Boulder Opal for sale. Boulder Opal has an earthy brown base-color mixed with the whole color spectrum of opal. This is the perfect gemstone for jewelry designers and hobby jewelers as well. We stock Boulder Opals in a large variety of shapes, sizes and price ranges. Use the filters on this page to quickly select the perfect fitting Boulder Opal for your jewelry needs. We ship our gemstones worldwide with a variety of shipping options.

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33.73ct Multicolor Boulder Opal

ID: 524127
Weight: 33.73ct
Size: 35.2 x 23.5 mm
Clarity: Translucent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 185.52
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25.75ct Multicolor Boulder Opal

ID: 521765
Weight: 25.75ct
Size: 21 x 18.4 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 141.63
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16.81ct Multicolor Boulder Opal

ID: 628411
Weight: 16.81ct
Size: 28.8 x 13.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 84.05
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24.07ct Multicolor Boulder Opal

ID: 628406
Weight: 24.07ct
Size: 22.2 x 18.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 120.35
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21.16ct Multicolor Boulder Opal

ID: 678766
Weight: 21.16ct
Size: 25.6 x 16.9 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 105.80
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17.29ct Multicolor Boulder Opal

ID: 523720
Weight: 17.29ct
Size: 27 x 17.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 95.10
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30.94ct Multicolor Boulder Opal

ID: 521754
Weight: 30.94ct
Size: 25.4 x 20.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 170.17
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23.38ct Multicolor Boulder Opal

ID: 678676
Weight: 23.38ct
Size: 25.3 x 16.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 116.90
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21.59ct Multicolor Boulder Opal

ID: 679148
Weight: 21.59ct
Size: 24.1 x 18.3 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 107.95
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17.73ct Multicolor Boulder Opal

ID: 628050
Weight: 17.73ct
Size: 23.7 x 15.3 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 88.65
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17.03ct Multicolor Boulder Opal

ID: 522982
Weight: 17.03ct
Size: 26.9 x 13.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 93.67
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35.80ct Multicolor Boulder Opal

ID: 575232
Weight: 35.80ct
Size: 36.6 x 19.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 118.14
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19.33ct Multicolor Boulder Opal

ID: 679214
Weight: 19.33ct
Size: 26 x 15.9 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 96.65
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20.80ct Multicolor Boulder Opal

ID: 522410
Weight: 20.80ct
Size: 32.3 x 16.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 114.40
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20.30ct Multicolor Boulder Opal

ID: 679245
Weight: 20.30ct
Size: 25.5 x 16 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 101.50
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35.99ct Multicolor Boulder Opal

ID: 575226
Weight: 35.99ct
Size: 45 x 23.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 107.97
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33.71ct Multicolor Boulder Opal

ID: 523722
Weight: 33.71ct
Size: 32.6 x 22.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 185.41
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5.29ct Multicolor Boulder Opal

ID: 679242
Weight: 5.29ct
Size: 17.4 x 12.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 26.45
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12.38ct Multicolor Boulder Opal

ID: 627961
Weight: 12.38ct
Size: 24.5 x 17.6 mm
Clarity: Translucent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 61.90
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8.27ct Multicolor Boulder Opal

ID: 678678
Weight: 8.27ct
Size: 27.2 x 8.3 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 41.35
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12.97ct Multicolor Boulder Opal

ID: 636047
Weight: 12.97ct
Size: 19.6 x 15.8 mm
Clarity: Translucent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 90.79
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25.02ct Multicolor Boulder Opal

ID: 636159
Weight: 25.02ct
Size: 29.5 x 18.4 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 175.14
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7.17ct Multicolor Boulder Opal

ID: 628029
Weight: 7.17ct
Size: 22.5 x 8.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 50.19
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11.89ct Multicolor Boulder Opal

ID: 575168
Weight: 11.89ct
Size: 29.6 x 9.9 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 35.67
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20.94ct Multicolor Boulder Opal

ID: 678776
Weight: 20.94ct
Size: 22.8 x 14.9 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 104.70
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16.01ct Multicolor Boulder Opal

ID: 523156
Weight: 16.01ct
Size: 30.6 x 12.4 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 88.06
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10.36ct Multicolor Boulder Opal

ID: 627963
Weight: 10.36ct
Size: 19.6 x 11.4 mm
Clarity: Translucent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 51.80
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18.73ct Multicolor Boulder Opal

ID: 522179
Weight: 18.73ct
Size: 23.5 x 20.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 103.02
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11.19ct Multicolor Boulder Opal

ID: 627970
Weight: 11.19ct
Size: 18.2 x 14.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 55.95
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14.54ct Multicolor Boulder Opal

ID: 627851
Weight: 14.54ct
Size: 20 x 13.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 72.70
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9.35ct Multicolor Boulder Opal

ID: 627856
Weight: 9.35ct
Size: 17.6 x 14.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 46.75
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7.58ct Multicolor Boulder Opal

ID: 628049
Weight: 7.58ct
Size: 18 x 9.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 37.90
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11.42ct Multicolor Boulder Opal

ID: 678872
Weight: 11.42ct
Size: 21.7 x 18.6 mm
Clarity: Transparent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 57.10
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17.55ct Multicolor Boulder Opal

ID: 365230
Weight: 17.55ct
Size: 19.4 x 13.3 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 135.14
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18.63ct Multicolor Boulder Opal

ID: 628388
Weight: 18.63ct
Size: 19.6 x 17.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 93.15
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11.00ct Multicolor Boulder Opal

ID: 678873
Weight: 11.00ct
Size: 22.3 x 11.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 55.00
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9.26ct Multicolor Boulder Opal

ID: 628032
Weight: 9.26ct
Size: 21.4 x 15.4 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 64.82
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10.79ct Multicolor Boulder Opal

ID: 523719
Weight: 10.79ct
Size: 23.3 x 13.3 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 53.95
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11.23ct Multicolor Boulder Opal

ID: 679243
Weight: 11.23ct
Size: 18.3 x 12.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 56.15
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11.24ct Multicolor Boulder Opal

ID: 679238
Weight: 11.24ct
Size: 16.7 x 13.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 56.20
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21.82ct Multicolor Boulder Opal

ID: 522174
Weight: 21.82ct
Size: 26.8 x 20.2 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 120.01
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13.99ct Multicolor Boulder Opal

ID: 679143
Weight: 13.99ct
Size: 20.7 x 12.6 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 69.95
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16.83ct Multicolor Boulder Opal

ID: 628391
Weight: 16.83ct
Size: 23.2 x 16 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 84.15
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6.16ct Multicolor Boulder Opal

ID: 679147
Weight: 6.16ct
Size: 16.7 x 9.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 30.80
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22.35ct Multicolor Boulder Opal

ID: 678881
Weight: 22.35ct
Size: 25.9 x 22 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 111.75
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10.04ct Multicolor Boulder Opal

ID: 365252
Weight: 10.04ct
Size: 15.2 x 12.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 77.31
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20.13ct Multicolor Boulder Opal

ID: 522176
Weight: 20.13ct
Size: 28.4 x 17.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 110.72
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7.85ct Multicolor Boulder Opal

ID: 629225
Weight: 7.85ct
Size: 16.4 x 11.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 54.95
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12.25ct Multicolor Boulder Opal

ID: 628410
Weight: 12.25ct
Size: 30.2 x 15.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 61.25
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17.61ct Multicolor Boulder Opal

ID: 628052
Weight: 17.61ct
Size: 22.8 x 17.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 88.05
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13.52ct Multicolor Boulder Opal

ID: 365223
Weight: 13.52ct
Size: 26.5 x 11.8 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 104.10
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9.66ct Multicolor Boulder Opal

ID: 678672
Weight: 9.66ct
Size: 26.4 x 12.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 48.30
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25.69ct Multicolor Boulder Opal

ID: 679216
Weight: 25.69ct
Size: 25.7 x 15.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 128.45
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6.10ct Multicolor Boulder Opal

ID: 678875
Weight: 6.10ct
Size: 17 x 11.5 mm
Clarity: Transparent
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 30.50
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13.21ct Multicolor Boulder Opal

ID: 365224
Weight: 13.21ct
Size: 14.4 x 14.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 101.72
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14.15ct Multicolor Boulder Opal

ID: 678773
Weight: 14.15ct
Size: 17.9 x 14.9 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 70.75
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9.73ct Multicolor Boulder Opal

ID: 679220
Weight: 9.73ct
Size: 15.7 x 11.7 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 48.65
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8.10ct Multicolor Boulder Opal

ID: 679224
Weight: 8.10ct
Size: 21.3 x 12.1 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 40.50
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10.26ct Multicolor Boulder Opal

ID: 678767
Weight: 10.26ct
Size: 19.2 x 10.5 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 51.30
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13.29ct Multicolor Boulder Opal

ID: 627967
Weight: 13.29ct
Size: 21.7 x 13.6 mm
Clarity: Opaque
Content: 1 pc
Shape: Fancy Cabochon
Treatment: Untreated
Origin: Australia
Type: Natural Boulder Opal
Price: $ 66.45
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Opals really are a mixed bag of gemstones. Just some of the varieties include white opals, black opals, fire opals, pink Peruvian opals, hyalite opals and I could go on for quite a while yet.

Boulder Opals are one of the better known gemstones in this family. They are distinct from most other opals by still being connected to the rock in which they formed.

This means that the thin slivers of precious opal have a substantial foundation so it is much more durable and the dark rock is a perfect background for the vibrant play-of-color.

Boulder Opal Colors

There is no such thing as a typical Boulder Opal color. Every gemstone is different in both shape and color with every color of the rainbow a possibility. Not only can Boulder Opals feature all colors but as the stone moves other colors can flash or dance before your eyes.

The precious opal material that forms in cracks and crevices within the host rock is made up of tiny spheres in which light can bounce around creating the dazzling colors.

Larger spheres bring out the red colors while smaller spheres show up as blue. Large spheres are rarer so any Boulder Opal showing colors such as red or orange - the ones at the top of the rainbow - will be more expensive than the blues and greens found at the bottom.

Read more about gemstones colors here

Boulder Opal Species

Boulder Opals are just one of many types of opals found around the world. Some have the famous play-of-color while others are a single color but all are fascinating gemstones.

Just a few of the more well-known ones are:

And there are many more besides.

Boulder Opal Price

Like most gemstones, it is the color of the Boulder Opal that is the number one consideration when appraising its price. However, there are a couple of extra considerations to bear in mind with this stone.

There is the coverage - a gemstone that has a large area of precious opal spread over the surface will get a higher price than one with a few spots here and there.

A contrast between a dark background and a bright color can increase the value of the opal.

As we mentioned earlier, some colors are rarer than others and a simple rule is to work your way down the rainbow with the red at the top being the most expensive and the purple at the bottom being the least expensive.

This is a very basic rule which can vary from stone to stone with the coverage and contrast aspects to bear in mind.

Carat Weight

Boulder Opals are precious opal material still connected to the base rock so they tend to be quite large gemstones. They can also be irregular shapes to incorporate as much of the naturally occurring opal as possible.

Pricing Boulder Opals on carat weight can be a little tricky as there is often a lot of ironstone or sandstone left after cutting and polishing. It may be a very thick and heavy stone with just a thin veneer of colored opal on the front.

It is best to choose your Boulder Opal based on physical size - the length, width and height - rather than carat size. As a very rough guide, Boulder Opals can be anything from $2 to $15 per carat for basic colors up to $50 to $800 per carat for gemstones with outstanding colors, depending on color, coverage and contrast.

Treatments

Generally, Boulder Opals are a completely natural gemstone with no treatment other than cutting and polishing.

As we have said, the contrast between the opal and the rock background can increase the value so there have been cases of the base rock being smoked or soaked in sugar to darken up the body but this is not very common in Boulder Opals and happens more with Black Opals.

Sometimes the precious opal can come loose from the rock backing and can be reattached with glue or resin. This would be difficult to spot unless a sudden impact or high heat breaks the seal but we are not aware of this being a serious problem.

Any treatment received by any of our gemstones is clearly disclosed.

Where are Boulder Opals found?

Basically all Boulder Opals come from central Queensland. This may not sound that impressive but it is an area about the size of California and home to about 200,000 people (and lots of kangaroos, rock wallabies, goannas and spiders).

What jewelry is Boulder Opal suitable for?

Boulder Opals have a rating of 5.5 to 6.5 on Mohs hardness scale. This would usually make them a little bit fragile for many jewelry items and not suitable for daily wear, however Boulder Opals are still attached to the durable rocks they formed in so are much tougher than the rating would suggest.

Large and striking Boulder Opals cut into interesting odd shapes can help create wonderful and unique jewelry items, especially pendants, brooches and earrings where durability is not such an issue. Boulder opal rings in protective settings can be particularly striking items of jewelry.

Birthstones and Anniversaries

Boulder Opals are the birthstone of October and would make an ideal gift for anyone celebrating a birthday in that month.

A Boulder Opal is the traditional gemstone gift for the 14th wedding anniversary.

Read All

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Overall Rating -> 9 star ratings

Not easy enough to buy by exact size, and many stones aren't carbechon curved shape on top

Posted By Erick in July, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Great selection

Posted By GHS40 in December, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Very good customer service. I had an issue on my end with shipping and I received a response the next day!

Posted By Orphanboy in December, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Trustworthy site. I've had several good experiences with company. Products always have met my expectations. Thank you.

Posted By Ray in February, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

I found it to be easy to browse and easy to use

Posted By Kyle in December, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

The website is user friendly, has excellent selection. I've always found what I was looking for with Gem Select. When others don't have it they do. And most important, they have a way for you to pay without using PayPal. I cannot use PayPal they closed my account because of no cell phone.

Posted By NJD in September, 2023
Source: Bizrate

Overall Rating -> 10 star ratings

Easy and fast

Posted By Mark in February, 2024
Source: Bizrate

Overall Rating -> 10 star ratings

Best place to buy gem stones, dont bother shopping else where. Prices are great, no issues with shipping and customer service is the best.

Posted By J in December, 2023
Source: Bizrate
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