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ID: 4618751 pcs
thumb image of 4.8ct Fancy Cabochon Multicolor Boulder Opal (ID: 461875)
4.78 ct Boulder Opal
13.2 x 9.9 mm
$ 33.56
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ID: 3711021 pcs
thumb image of 4ct Pear Cabochon Multicolor Boulder Opal (ID: 371102)
4.00 ct Boulder Opal
15.8 x 7.6 mm
$ 29.16
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ID: 4535321 pcs
thumb image of 25.9ct Oval Cabochon Multicolor Boulder Opal (ID: 453532)
25.92 ct Boulder Opal
28.4 x 15.5 mm
$ 570.24
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ID: 3660771 pcs
thumb image of 86.1ct Trillion Cabochon Multicolor Boulder Opal (ID: 366077)
86.05 ct Boulder Opal
43 x 37.4 mm
$ 988.50
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ID: 4535591 pcs
thumb image of 27.9ct Fancy Cabochon Multicolor Boulder Opal (ID: 453559)
27.93 ct Boulder Opal
26 x 18.5 mm
$ 614.46
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ID: 4535331 pcs
thumb image of 27.4ct Oval Cabochon Multicolor Boulder Opal (ID: 453533)
27.43 ct Boulder Opal
35.8 x 12.4 mm
$ 603.46
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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: 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: 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: 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: 4618681 pcs
thumb image of 12.1ct Oval Cabochon Multicolor Boulder Opal (ID: 461868)
12.14 ct Boulder Opal
18.6 x 12.8 mm
$ 85.22
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ID: 4495981 pcs
thumb image of 12.4ct Cushion Cabochon Multicolor Boulder Opal (ID: 449598)
12.42 ct Boulder Opal
17.1 x 14.5 mm
$ 86.94
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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: 4207541 pcs
thumb image of 13.3ct Fancy Cabochon Multicolor Boulder Opal (ID: 420754)
13.34 ct Boulder Opal
20.3 x 11.9 mm
$ 80.04
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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: 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: 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: 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: 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: 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: 4207821 pcs
thumb image of 12.4ct Fancy Cabochon Multicolor Boulder Opal (ID: 420782)
12.42 ct Boulder Opal
18.1 x 13.1 mm
$ 74.52
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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.

Browse Similar or Related Gemstones:
All Opal Gemstones
Black Opal Gemstones
Opal Doublet Gemstones
Opal in Matrix Gemstones
Fire Opal Gemstones

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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

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

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