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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (97): Boulder Opal Boulder Opal Clear All
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ID: 3107651 pcs
7.27ct Boulder Opal
19.96 x 9.30 x 5.54mm
USD 196.29
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ID: 4206321 pcs
8.77ct Boulder Opal
14.13 x 11.34 x 6.69mm
USD 52.62
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ID: 4207821 pcs
12.42ct Boulder Opal
18.11 x 13.08 x 6.36mm
USD 74.52
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ID: 3711021 pcs
4.00ct Boulder Opal
15.84 x 7.56 x 5.53mm
USD 29.16
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ID: 4207281 pcs
3.64ct Boulder Opal
12.20 x 7.37 x 5.05mm
USD 21.84
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ID: 4207541 pcs
13.34ct Boulder Opal
20.34 x 11.85 x 6.73mm
USD 80.04
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ID: 3219281 pcs
45.15ct Boulder Opal
33.43 x 19.84 x 7.85mm
USD 316.05
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ID: 3218451 pcs
22.54ct Boulder Opal
24.79 x 20.04 x 5.56mm
USD 157.78
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ID: 4207791 pcs
14.72ct Boulder Opal
22.91 x 11.58 x 6.23mm
USD 88.32
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ID: 3004501 pcs
33.36ct Boulder Opal
28.14 x 19.04 x 7.02mm
USD 233.52
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ID: 3139231 pcs
22.51ct Boulder Opal
26.47 x 19.55 x 6.13mm
USD 157.57
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ID: 4206751 pcs
11.21ct Boulder Opal
17.95 x 13.59 x 5.71mm
USD 67.26
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ID: 3652241 pcs
13.21ct Boulder Opal
14.39 x 14.08 x 7.05mm
USD 92.47
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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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