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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (88): Boulder Opal Boulder Opal Clear All
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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: 4206801 pcs
12.77ct Boulder Opal
18.90 x 12.93 x 6.46mm
USD 76.62
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ID: 3218381 pcs
20.90ct Boulder Opal
23.48 x 19.55 x 6.06mm
USD 146.30
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ID: 3029171 pcs
5.66ct Boulder Opal
14.04 x 9.90 x 5.61mm
USD 39.62
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ID: 4089501 pcs
8.87ct Boulder Opal
13.37 x 11.14 x 6.67mm
USD 62.09
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ID: 4207561 pcs
4.45ct Boulder Opal
16.02 x 8.65 x 4.62mm
USD 26.70
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ID: 3107461 pcs
10.52ct Boulder Opal
21.67 x 12.99 x 5.39mm
USD 73.64
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ID: 3219241 pcs
40.79ct Boulder Opal
27.51 x 23.02 x 8.08mm
USD 285.53
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ID: 3218461 pcs
21.64ct Boulder Opal
21.16 x 20.64 x 5.30mm
USD 151.48
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ID: 2480001 pcs
13.14ct Boulder Opal
19.47 x 13.51 x 5.47mm
USD 91.98
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ID: 3219231 pcs
35.81ct Boulder Opal
26.35 x 23.49 x 8.09mm
USD 250.67
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ID: 3218391 pcs
26.23ct Boulder Opal
23.22 x 17.01 x 9.46mm
USD 183.61
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ID: 4207831 pcs
16.69ct Boulder Opal
24.73 x 12.40 x 6.10mm
USD 100.14
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ID: 3227901 pcs
13.97ct Boulder Opal
40.10 x 13.00 x 3.23mm
USD 377.19
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ID: 4206811 pcs
9.90ct Boulder Opal
17.72 x 14.03 x 5.08mm
USD 59.40
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ID: 3656211 pcs
6.99ct Boulder Opal
14.34 x 10.97 x 5.35mm
USD 48.93
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ID: 3107621 pcs
6.07ct Boulder Opal
19.13 x 7.70 x 4.89mm
USD 163.89
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ID: 3029191 pcs
7.81ct Boulder Opal
16.37 x 10.48 x 6.19mm
USD 54.67
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ID: 3693951 pcs
4.97ct Boulder Opal
11.04 x 9.89 x 5.08mm
USD 34.79
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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: 3029151 pcs
23.48ct Boulder Opal
21.30 x 6.95mm
USD 164.36
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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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