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You Selected (92): Boulder Opal Boulder Opal Clear All
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ID: 3365761 pcs
thumb image of 15.8ct Round Cabochon Multicolor Boulder Opal (ID: 336576)
15.80 ct Boulder Opal
18.6 mm
$ 110.60
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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: 3108151 pcs
thumb image of 16.3ct Oval Cabochon Multicolor Boulder Opal (ID: 310815)
16.32 ct Boulder Opal
18.7 x 14.7 mm
$ 114.24
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ID: 4495251 pcs
thumb image of 15.9ct Oval Cabochon Multicolor Boulder Opal (ID: 449525)
15.88 ct Boulder Opal
22.8 x 15.2 mm
$ 111.16
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ID: 3218361 pcs
thumb image of 13.4ct Pear Cabochon Multicolor Boulder Opal (ID: 321836)
13.35 ct Boulder Opal
21.4 x 15 mm
$ 93.45
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ID: 3218371 pcs
thumb image of 16.9ct Pear Cabochon Multicolor Boulder Opal (ID: 321837)
16.89 ct Boulder Opal
20.7 x 14.8 mm
$ 118.23
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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: 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: 4206711 pcs
thumb image of 15.6ct Oval Cabochon Multicolor Boulder Opal (ID: 420671)
15.56 ct Boulder Opal
19.3 x 14.3 mm
$ 93.36
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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: 4207791 pcs
thumb image of 14.7ct Fancy Cabochon Multicolor Boulder Opal (ID: 420779)
14.72 ct Boulder Opal
22.9 x 11.6 mm
$ 88.32
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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: 3218381 pcs
thumb image of 20.9ct Pear Cabochon Multicolor Boulder Opal (ID: 321838)
20.90 ct Boulder Opal
23.5 x 19.6 mm
$ 146.30
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ID: 3227301 pcs
thumb image of 11.9ct Round Cabochon Multicolor Boulder Opal (ID: 322730)
11.89 ct Boulder Opal
14.9 mm
$ 83.23
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ID: 4495291 pcs
thumb image of 11.1ct Pear Cabochon Multicolor Boulder Opal (ID: 449529)
11.13 ct Boulder Opal
17.7 x 15.6 mm
$ 77.91
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ID: 4207441 pcs
thumb image of 12.9ct Oval Cabochon Multicolor Boulder Opal (ID: 420744)
12.87 ct Boulder Opal
21 x 10 mm
$ 77.22
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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: 4618761 pcs
thumb image of 10.7ct Oval Cabochon Multicolor Boulder Opal (ID: 461876)
10.73 ct Boulder Opal
19.9 x 10.4 mm
$ 75.32
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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: 4206821 pcs
thumb image of 22.7ct Fancy Cabochon Multicolor Boulder Opal (ID: 420682)
22.65 ct Boulder Opal
29.3 x 12.9 mm
$ 135.90
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ID: 3107461 pcs
thumb image of 10.5ct Pear Cabochon Multicolor Boulder Opal (ID: 310746)
10.52 ct Boulder Opal
21.7 x 13 mm
$ 73.64
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Boulder Opal

Boulder opal is the second most prized form of opal, after black opal. The name derives from the fact that boulder opal is found embedded in ironstone boulders. The opal usually forms as thin veins within these boulders, and most stones are cut to include some of the host ironstone matrix. Boulder opal is sometimes referred to as opal in matrix for this reason. Boulder opal is especially attractive because, like the black opal, it has a dark body tone which adds vibrancy to the play of color. Boulder opal also has a higher density because of the ironstone content, and can be more durable as well.

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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

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