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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: 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: 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: 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: 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: 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: 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: 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: 4495221 pcs
thumb image of 13.1ct Oval Cabochon Multicolor Boulder Opal (ID: 449522)
13.05 ct Boulder Opal
20.2 x 14.3 mm
$ 91.35
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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: 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: 3004541 pcs
thumb image of 20.9ct Oval Cabochon Multicolor Boulder Opal (ID: 300454)
20.92 ct Boulder Opal
25.5 x 14.9 mm
$ 146.44
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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: 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: 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: 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: 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: 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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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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