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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: 3107631 pcs
7.78ct Boulder Opal
16.59 x 10.92 x 5.26mm
USD 210.06
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ID: 3652491 pcs
10.40ct Boulder Opal
19.49 x 12.62 x 5.66mm
USD 72.80
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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: 3029001 pcs
23.34ct Boulder Opal
20.78 x 14.01 x 9.08mm
USD 163.38
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ID: 4206711 pcs
15.56ct Boulder Opal
19.26 x 14.33 x 7.80mm
USD 93.36
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ID: 4206721 pcs
12.14ct Boulder Opal
16.61 x 13.33 x 6.65mm
USD 72.84
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ID: 3652311 pcs
15.09ct Boulder Opal
16.39 x 6.37mm
USD 105.63
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ID: 3218421 pcs
22.67ct Boulder Opal
21.79 x 16.53 x 7.61mm
USD 158.69
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ID: 3695641 pcs
7.09ct Boulder Opal
13.92 x 11.90 x 4.88mm
USD 49.63
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ID: 4206781 pcs
11.91ct Boulder Opal
23.63 x 10.59 x 5.57mm
USD 71.46
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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: 4206281 pcs
9.05ct Boulder Opal
15.95 x 10.93 x 5.81mm
USD 54.30
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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: 4206331 pcs
8.17ct Boulder Opal
19.97 x 10.51 x 4.79mm
USD 49.02
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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: 3660771 pcs
86.05ct Boulder Opal
43.03 x 37.37 x 8.09mm
USD 988.50
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ID: 3218371 pcs
16.89ct Boulder Opal
20.66 x 14.77 x 7.56mm
USD 456.03
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ID: 3219261 pcs
21.46ct Boulder Opal
28.91 x 18.77 x 4.73mm
USD 150.22
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ID: 3004561 pcs
20.74ct Boulder Opal
23.08 x 15.03 x 7.65mm
USD 145.18
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ID: 3219201 pcs
21.04ct Boulder Opal
27.85 x 12.77 x 6.45mm
USD 147.28
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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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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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