Rough opal specimens from $13.50 USD to $225.00 USD

Rough opal specimens from $13.50 to $225.00 USD
Choose from our large range of natural rough opal specimens.
We are offering 2 varieties of opal specimens:
Boulder opal and boulder matrix opal which are only found in Outback Queensland. Matrix opal is when opal is mixed with the mother rock.
The base of some specimens has been sawn off to reduce their weight.
Some have been photographed in water to show up the opal colours.
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Please note: > 24.4 millimetres (mm) equal 1 inch - 10 millimetres equal 0.39 inch.
> 1 ounce equals 28.34 grams - 100 grams equal 3.5 ounces.

RBS294 - $75.00 USD
Rough boulder opal specimen
Dimensions: 75 mm x 75 mm x 40 mm maximum thickness
Weight : 294 grams
Blue and green opal

RBS156 -$80.00 USD
Rough boulder opal specimen
Dimensions: 52 mm x 62 mm x 21 mm maximum thickness
Weight : 156 grams
Blue opal

RBS158 - $90.00 USD
Rough boulder opal specimen
Dimensions: 92 mm x 50 mm x 36 mm of
maximum thickness
Weight : 158 grams
Black opal- Strong dark blue

RBS513 - $115.00 USD SOLD
Rough boulder opal specimen
Dimensions: 120 mm x 65 mm x 50 mm of maximum thickness
Weight : 513 grams - Blue opal

RBS513 - Rough boulder opal specimen - $115 USD

RBS587 - $90.00 USD SOLD
Rough boulder opal specimen
Dimensions: 90 mm x 75 mm x 65 mm maximum thickness
Weight : 587 grams
Blue opal with some more showing on 2 sides

RBS485 - $80.00 USD
Rough boulder opal specimen
Dimensions: 110 mm x 60 mm x 55 mm maximum thickness
Weight : 485 grams
White opal full of colours including red and green line of opal
on top

RBS841 - $100.00 USD
Rough boulder opal specimen
Dimensions: 100 mm x 70 mm x 90 mm of maximum thickness
Weight : 841 grams
Left photo: Large face of grey potch with numerous spots of light colours
Right hand side photo shows 2 small more faces with traces of colours and a rolling line of electric colour

RBS233 - $100.00 USD
Rough boulder opal specimen
Dimensions: 100 mm x 80 mm x 25 mm maximum
thickness
Weight : 233 grams
Blue and green opal

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RBS1 - $13.50 USD SOLD
Rough boulder opal specimen with green crystal
opal in the centre
Dimensions: 56 mm x 48 mm
Weight : 73 grams

RMS1 - $13.50 USD SOLD
Lot of 5 rough boulder opal matrix specimens
Dimensions: From 40mm x 22 mm to 56 mm x 32 mm
Mainly blue colours - the colours will show brilliantly when
dipped in water - Total weight : 143 grams

RBS400g - $90.00 USD SOLD
Rough boulder opal specimen
Dimensions: 90 mm x 70 mm x 40 mm of maximum thickness
Weight : 400 grams
Open veins of opal all around this specimen with varied light colours

RBS634g - $115.00 USD SOLD
Rough boulder opal specimen
Dimensions: 110 mm x 80 mm x 40 mm
maximum thickness
Weight : 634 grams
Full face of opal with varied colours

Click on each picture to make it bigger, the opal colours will be more visible

RMS3 - $35.00 USD
Lot of 5 rough boulder opal matrix specimens
Dimensions: From 29 mm x 16 mm to 41 mm x 21 mm
Mixed colours - the colours will show brilliantly when
dipped in water - Total weight : 72 grams

RMSPL2 - $23.00 USD SOLD
Rough Boulder matrix opal split
Total weight: 72 carats
Dimensions: 25mm x 18 mm and 28 mm x 17 mm
This split fits perfectly when joined together
Brilliant dark electric colours with green dominating

RMS6 - $34.00 USD SOLD
Lot of 9 rough boulder opal matrix specimens
Dimensions: From 19.90 x 14.60 mm
to 28.90 mm x 20.60 mm - Total weight : 68 grams
Mostly bright green colours - the colours will show
brilliantly when dipped in water -

RMS8 - $35.00 USD
Lot of 5 rough boulder opal matrix specimens
Dimensions: From 21 x 21 mm to 41 mm x 18.50 mm
Total weight : 68 grams
Mixed colours with red in every piece - the colours show
brilliantly when dipped in water

RMS9 - $35.00 USD
Lot of 8 rough boulder opal matrix specimens
Dimensions: From 19 x 14 mm to 37 x 27 mm
Total weight : 69 grams
Mixed colours with red in every piece- the colours show
brilliantly when dipped in water

RB45 - $200.00 USD
Rough boulder opal with some crystal opal and darker opal
Size: 76.35 x 57 mm and 61.70 mm high
Weight: 293 grams.
A good mix of colours including red; 3 opal seams have not been opened

RMS7 - $30.00 USD SOLD
Lot of 7 rough boulder opal matrix specimens
Dimensions: From 21.80 x 18.50 mm to 33.20 x 13.20 mm
Total weight : 60 grams
Bright green colours - the colours will show brilliantly
when dipped in water -

RMS10 - $25.00 USD SOLD
Lot of 15 rough boulder opal matrix specimens
Dimensions: From 17.50 x 12 mm to 22 x 16 mm
Total weight : 50 grams
Bright green colours - the colours show brilliantly when
dipped in water -

RMS11 - $25.00 USD SOLD
Lot of 10 rough boulder opal matrix specimens
Dimensions: From 16.75 x 16 mm to 26 x 15 mm
Total weight : 50 grams
Bright green colours - the colours show brilliantly when
dipped in water -

RMS13 - $60.00 USD
Lot of 9 rough boulder opal matrix specimens
Dimensions: From 24.50 x 16 mm to 36 mm x 34 mm
Total weight : 125 grams
Mixed colours with some red - the colours show brilliantly
when dipped in water

RMS12 - $45.00 USD SOLD
Lot of 10 rough boulder opal matrix specimens
Dimensions: From 22.70 x 18 mm to 29 mm x 19.75 mm
Total weight : 90 grams
Green and blue colours with some red - the colours show
brilliantly when dipped in water

RBS35 - $20.00 USD
Rough boulder opal specimen
Dimensions: 54.23 x 40.50 mm x 9 mm thick
Total weight: 33 grams
Bright white opal with cracks

RBS105g - $25.00 USD
Unusual Rough boulder opal specimen
Dimensions: 62 x 48.85 mm x 40.43 mm thick
Total weight: 105 grams
Inclusions of crystal opal in relatively hard clay

RBS79 - $40.00 USD
Rough boulder opal specimen
Dimensions: 57.30 x 41.50 mm x 24.19 mm thick
Total weight: 79 grams
Bright crystal opal

RBS26g -$100.00 USD
Rough boulder opal specimen
Dimensions: 58.18 mm x 32.80 mm x 20 mm of maximum thickness
Weight: 26 grams
A good variety of bright colours including red

RBS28g -$80.00 USD
Rough boulder opal specimen
Dimensions: 40 mm x 33.22 mm x 25.15 mm of maximum thickness
Weight: 28 grams
Beautiful gem colours on 2 sides.

RB44 - $400.00 USD
Rough boulder opal with some crystal opal and darker opal
Size: 126 x 125.60 mm and 48.28 mm high
Weight: 594 grams.
Very good colours; 1 opal seam going right around has not been opened.
Could be polished as a whole, or stones could be cut out of it.

RB46 - $800.00 USD
Rough boulder opal with some crystal opal and darker opal
Size: 92 x 62 mm and 57.39 mm high
Weight: 482 grams.
These photos show the 3 partly opened sides, the top and bottom.
Very good colours with some red;1 opal seam has not been opened.
Could be polished as a whole, or stones could be cut out of it.

RB42 - $1200.00 USD
Rough boulder opal ( has been preformed but not polished)
Size: 77.42 x 52.32 mm and 16.70 mm thick
Weight: 106 grams.
very large crystal opal with some sparkling colours

RB43 - $1500.00 USD
Rough boulder opal with some crystal opal and darker opal
Size: 125.86 x 75 mm and 58 mm high
Weight: 634 grams.
These photos show the 3 partly opened sides and the bottom
Very good colours with some red; the patch of ironstone visible on photos
2 and 3, has the seam of opal running underneath and another opal seam
has not been opened.
Could be polished as a whole, or small stones could be cut out of it.