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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (114): Boulder Opal Clear All
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ID: 3004531 pcs
28.58ct Boulder Opal
23.12mm x 18.45mm x 7.13mm
USD 200.06
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ID: 4207561 pcs
4.45ct Boulder Opal
16.02mm x 8.65mm x 4.62mm
USD 26.70
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ID: 3660771 pcs
86.05ct Boulder Opal
43.03mm x 37.37mm x 8.09mm
USD 988.50
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ID: 4206231 pcs
8.58ct Boulder Opal
15.57mm x 11.62mm x 5.68mm
USD 51.48
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ID: 4207831 pcs
16.69ct Boulder Opal
24.73mm x 12.40mm x 6.10mm
USD 100.14
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ID: 3004561 pcs
20.74ct Boulder Opal
23.08mm x 15.03mm x 7.65mm
USD 145.18
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ID: 4207801 pcs
10.63ct Boulder Opal
16.63mm x 12.34mm x 6.04mm
USD 63.78
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ID: 3653121 pcs
4.95ct Boulder Opal
11.31mm x 9.20mm x 5.63mm
USD 34.65
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ID: 3218351 pcs
8.60ct Boulder Opal
18.86mm x 12.49mm x 5.41mm
USD 60.20
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ID: 3218451 pcs
22.54ct Boulder Opal
24.79mm x 20.04mm x 5.56mm
USD 157.78
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ID: 3219211 pcs
21.32ct Boulder Opal
27.33mm x 13.10mm x 5.82mm
USD 149.24
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ID: 3711021 pcs
4.00ct Boulder Opal
15.84mm x 7.56mm x 5.53mm
USD 29.16
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ID: 4207531 pcs
25.57ct Boulder Opal
24.83mm x 15.84mm x 7.78mm
USD 153.42
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ID: 4206791 pcs
17.78ct Boulder Opal
20.53mm x 14.57mm x 8.19mm
USD 106.68
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ID: 4206761 pcs
13.33ct Boulder Opal
18.87mm x 12.65mm x 6.58mm
USD 79.98
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ID: 4206291 pcs
9.05ct Boulder Opal
13.93mm x 12.15mm x 6.27mm
USD 54.30
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ID: 4207661 pcs
4.46ct Boulder Opal
14.60mm x 9.21mm x 3.38mm
USD 26.76
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ID: 3218381 pcs
20.90ct Boulder Opal
23.48mm x 19.55mm x 6.06mm
USD 146.30
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ID: 3219231 pcs
35.81ct Boulder Opal
26.35mm x 23.49mm x 8.09mm
USD 250.67
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ID: 3652481 pcs
11.33ct Boulder Opal
15.83mm x 12.78mm x 6.51mm
USD 79.31
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ID: 4206341 pcs
9.04ct Boulder Opal
29.06mm x 8.23mm x 5.10mm
USD 54.24
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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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