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ID: 4089501 pcs
thumb image of 8.9ct Oval Cabochon Multicolor Boulder Opal (ID: 408950)
8.87ct Boulder Opal
13.37 x 11.14 x 6.67mm
USD 62.09
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ID: 3652491 pcs
thumb image of 10.4ct Fancy Cabochon Multicolor Boulder Opal (ID: 365249)
10.40ct Boulder Opal
19.49 x 12.62 x 5.66mm
USD 72.80
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ID: 4207821 pcs
thumb image of 12.4ct Fancy Cabochon Multicolor Boulder Opal (ID: 420782)
12.42ct Boulder Opal
18.11 x 13.08 x 6.36mm
USD 74.52
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ID: 3107651 pcs
thumb image of 7.3ct Oval Cabochon Multicolor Boulder Opal (ID: 310765)
7.27ct Boulder Opal
19.96 x 9.30 x 5.54mm
USD 196.29
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ID: 4206341 pcs
thumb image of 9ct Fancy Cabochon Multicolor Boulder Opal (ID: 420634)
9.04ct Boulder Opal
29.06 x 8.23 x 5.10mm
USD 54.24
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ID: 3218451 pcs
thumb image of 22.5ct Oval Cabochon Multicolor Boulder Opal (ID: 321845)
22.54ct Boulder Opal
24.79 x 20.04 x 5.56mm
USD 157.78
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ID: 3029261 pcs
thumb image of 22.2ct Oval Cabochon Multicolor Boulder Opal (ID: 302926)
22.16ct Boulder Opal
22.69 x 18.08 x 6.29mm
USD 155.12
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ID: 4206711 pcs
thumb image of 15.6ct Oval Cabochon Multicolor Boulder Opal (ID: 420671)
15.56ct Boulder Opal
19.26 x 14.33 x 7.80mm
USD 93.36
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ID: 3219241 pcs
thumb image of 40.8ct Pear Cabochon Multicolor Boulder Opal (ID: 321924)
40.79ct Boulder Opal
27.51 x 23.02 x 8.08mm
USD 285.53
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ID: 3004561 pcs
thumb image of 20.7ct Pear Cabochon Multicolor Boulder Opal (ID: 300456)
20.74ct Boulder Opal
23.08 x 15.03 x 7.65mm
USD 145.18
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ID: 4206721 pcs
thumb image of 12.1ct Fancy Cabochon Multicolor Boulder Opal (ID: 420672)
12.14ct Boulder Opal
16.61 x 13.33 x 6.65mm
USD 72.84
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ID: 3219201 pcs
thumb image of 21ct Oval Cabochon Multicolor Boulder Opal (ID: 321920)
21.04ct Boulder Opal
27.85 x 12.77 x 6.45mm
USD 147.28
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ID: 3221161 pcs
thumb image of 36.7ct Trillion Cabochon Multicolor Boulder Opal (ID: 322116)
36.68ct Boulder Opal
21.82 x 21.14 x 10.00mm
USD 256.76
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ID: 3693951 pcs
thumb image of 5ct Oval Cabochon Multicolor Boulder Opal (ID: 369395)
4.97ct Boulder Opal
11.04 x 9.89 x 5.08mm
USD 34.79
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ID: 4207781 pcs
thumb image of 11.6ct Fancy Cabochon Multicolor Boulder Opal (ID: 420778)
11.56ct Boulder Opal
16.38 x 12.57 x 6.65mm
USD 69.36
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ID: 3652241 pcs
thumb image of 13.2ct Fancy Cabochon Multicolor Boulder Opal (ID: 365224)
13.21ct Boulder Opal
14.39 x 14.08 x 7.05mm
USD 92.47
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ID: 4207561 pcs
thumb image of 4.5ct Fancy Cabochon Multicolor Boulder Opal (ID: 420756)
4.45ct Boulder Opal
16.02 x 8.65 x 4.62mm
USD 26.70
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ID: 4207831 pcs
thumb image of 16.7ct Oval Cabochon Multicolor Boulder Opal (ID: 420783)
16.69ct Boulder Opal
24.73 x 12.40 x 6.10mm
USD 100.14
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ID: 3029001 pcs
thumb image of 23.3ct Oval Cabochon Multicolor Boulder Opal (ID: 302900)
23.34ct Boulder Opal
20.78 x 14.01 x 9.08mm
USD 163.38
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ID: 3656271 pcs
thumb image of 6.8ct Fancy Cabochon Multicolor Boulder Opal (ID: 365627)
6.83ct Boulder Opal
13.30 x 10.91 x 5.44mm
USD 47.81
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ID: 3107621 pcs
thumb image of 6.1ct Oval Cabochon Multicolor Boulder Opal (ID: 310762)
6.07ct Boulder Opal
19.13 x 7.70 x 4.89mm
USD 163.89
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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

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

Note: 1ct = 0.2g

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