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 - Rough boulder opal specimen
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 - Rough boulder opal specimen
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
RBS158 - Rough boulder opal specimen
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 - Rough boulder opal specimen
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
RBS485 - Rough boulder opal specimen
RBS841 - Rough boulder opal specimen
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
RBS841 - Rough boulder opal specimen
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            
RBS233 - Rough boulder opal specimen -
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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
Rough Specimen RB400g a
Rough opal Specimen RB400g
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  
Rough opal specimen RBS634g
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         
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Click on each picture to make it  bigger, the opal colours will be more visible
rough boulder opal specimen
5 Rough matrix specimens RMS1
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
5 rough opal matrix specimens
RMSPL2-matrix split
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
9 Rough matrix opal specimens RMS6
5 Rough matrix opal specimens RMS8
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
5 Rough matrix opal specimens RMS9
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
rough boulder opal  RB45 b
rough boulder opal  RB45 c
rough boulder opal  RB45 d
rough boulder opal  RB45 e
rough boulder opal  RB45 f
rough boulder opal  RB45
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
7 Rough matrix opal specimens RMS7
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 -
15  Rough matrix specimens RMS10
10  Rough matrix specimens RMS11
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 -
10  Rough matrix opal specimens RMS12
9  Rough matrix opal specimens RMS13
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
Rough opal specimen RBS105g
Rough opal specimen RBS35g
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  
rough opal specimen RBS79g
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
Rough opal Specimen RBS26g
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
Rough opal specimen  RBS28g b
Rough opal specimen  RBS28g c
Rough opal specimen  RBS28g
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.
rough boulder opal  RB44 b
rough boulder opal  RB44 c
rough boulder opal  RB44 d
rough boulder opal  RB44 e
rough boulder opal  RB44 f
rough boulder opal  RB44
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.
rough boulder opal  RB46 b
rough boulder opal  RB46 c
rough boulder opal  RB46 e
rough boulder opal  RB46 g
rough boulder opal  RB46 h
rough boulder opal  RB46 i
rough boulder opal  RB46
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.
rough boulder opal  RB42
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
rough boulder opal  RB43 b
rough boulder opal  RB43 c
rough boulder opal  RB43 d
rough boulder opal  RB43
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.