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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (139): Australian Opal Gems - Opal, Opal Doublet, Boulder Opal, Black Opal Clear All
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ID: 3652301 pcs
thumb image of 17.6ct Fancy Cabochon Multicolor Boulder Opal (ID: 365230)
17.55 ct Boulder Opal
19.4 x 13.3 mm
$ 122.85
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ID: 3029211 pcs
thumb image of 17.3ct Oval Cabochon Multicolor Boulder Opal (ID: 302921)
17.33 ct Boulder Opal
28.8 x 14.7 mm
$ 121.31
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ID: 3004561 pcs
thumb image of 20.7ct Pear Cabochon Multicolor Boulder Opal (ID: 300456)
20.74 ct Boulder Opal
23.1 x 15 mm
$ 145.18
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ID: 3028991 pcs
thumb image of 17.3ct Pear Cabochon Multicolor Boulder Opal (ID: 302899)
17.27 ct Boulder Opal
23.5 x 13.5 mm
$ 120.89
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ID: 3219201 pcs
thumb image of 21ct Oval Cabochon Multicolor Boulder Opal (ID: 321920)
21.04 ct Boulder Opal
27.9 x 12.8 mm
$ 147.28
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ID: 4495971 pcs
thumb image of 21.2ct Pear Cabochon Multicolor Boulder Opal (ID: 449597)
21.20 ct Boulder Opal
25 x 18.5 mm
$ 148.40
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ID: 3219211 pcs
thumb image of 21.3ct Oval Cabochon Multicolor Boulder Opal (ID: 321921)
21.32 ct Boulder Opal
27.3 x 13.1 mm
$ 149.24
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ID: 3652311 pcs
thumb image of 15.1ct Round Cabochon Multicolor Boulder Opal (ID: 365231)
15.09 ct Boulder Opal
16.4 mm
$ 105.63
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ID: 3219261 pcs
thumb image of 21.5ct Pear Cabochon Multicolor Boulder Opal (ID: 321926)
21.46 ct Boulder Opal
28.9 x 18.8 mm
$ 150.22
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ID: 3652231 pcs
thumb image of 13.5ct Fancy Cabochon Multicolor Boulder Opal (ID: 365223)
13.52 ct Boulder Opal
26.5 x 11.8 mm
$ 94.64
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ID: 3218461 pcs
thumb image of 21.6ct Trillion Cabochon Multicolor Boulder Opal (ID: 321846)
21.64 ct Boulder Opal
21.2 x 20.6 mm
$ 151.48
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ID: 4468167 pcs
thumb image of 4.9ct Marquise Cabochon Multicolor Opal Doublet (ID: 446816)
4.93 ct Opal Doublet
10 x 5.1 mm
$ 73.95
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ID: 4469268 pcs
thumb image of 5ct Pear Cabochon Multicolor Opal Doublet (ID: 446926)
5.00 ct Opal Doublet
8 x 5.1 mm
$ 75.00
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ID: 4206741 pcs
thumb image of 15.5ct Fancy Cabochon Multicolor Boulder Opal (ID: 420674)
15.53 ct Boulder Opal
18.3 x 13.8 mm
$ 93.18
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ID: 3652241 pcs
thumb image of 13.2ct Fancy Cabochon Multicolor Boulder Opal (ID: 365224)
13.21 ct Boulder Opal
14.4 x 14.1 mm
$ 92.47
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ID: 4469289 pcs
thumb image of 4.3ct Pear Cabochon Multicolor Opal Doublet (ID: 446928)
4.29 ct Opal Doublet
7.1 x 5 mm
$ 64.35
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ID: 2480001 pcs
thumb image of 13.1ct Oval Cabochon Multicolor Boulder Opal (ID: 248000)
13.14 ct Boulder Opal
19.5 x 13.5 mm
$ 91.98
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ID: 4468197 pcs
thumb image of 5.2ct Marquise Cabochon Multicolor Opal Doublet (ID: 446819)
5.19 ct Opal Doublet
10.2 x 5.1 mm
$ 77.85
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ID: 3577841 pcs
thumb image of 9.7ct Shark Fin Cabochon Blue Opal Doublet (ID: 357784)
9.72 ct Opal Doublet
20.7 x 17.3 mm
$ 63.18
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ID: 44694015 pcs
thumb image of 5.6ct Oval Cabochon Multicolor Opal Doublet (ID: 446940)
5.55 ct Opal Doublet
6.2 x 4.2 mm
$ 83.25
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ID: 2940504 pcs
thumb image of 2.4ct Oval Cabochon Multicolor Opal Doublet (ID: 294050)
2.37 ct Opal Doublet
7.1 x 5.1 mm
$ 71.10
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Australian Opal Gems
Australia is the most important source for fine opal gemstones. Australian opals include black opal, boulder opal, crystal opal, fire opal and white opal. Famous opal deposits in New South Wales are at Lightning Ridge and White Cliffs, in South Australia, and also at Coober Pedy and Andamooka. Other opal deposits are also found in Queensland. Australia is the main source of the world's finest and largest supply of precious opal, including the rarest and most valuable Australian black opal. The best black opal is thought to come from Lightning Ridge in New South Wales. Australian opal is known for its incredible play of color and excellent stability. Opal gemstones make wonderfully unique and interesting jewelry. In 1993, Australia declared opal its national gemstone. Some of the finest and largest Australian opals ever seen include the multicolored precious opal gem called the Virgin Rainbow, from Coober Pedy, Big Ben, which was found in Lightning Ridge, the Light of the World and the Andamooka Desert Flame.
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

Size Comparison Chart