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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (103): Boulder Opal Clear All
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ID: 3029171 pcs
5.66ct Boulder Opal
14.04mm x 9.90mm x 5.61mm
USD 39.62
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ID: 3107381 pcs
6.43ct Boulder Opal
15.03mm x 12.10mm x 5.62mm
USD 45.01
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ID: 4207541 pcs
13.34ct Boulder Opal
20.34mm x 11.85mm x 6.73mm
USD 80.04
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ID: 4207821 pcs
12.42ct Boulder Opal
18.11mm x 13.08mm x 6.36mm
USD 74.52
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ID: 4207441 pcs
12.87ct Boulder Opal
21.01mm x 9.97mm x 6.75mm
USD 77.22
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ID: 3218421 pcs
22.67ct Boulder Opal
21.79mm x 16.53mm x 7.61mm
USD 158.69
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ID: 4207201 pcs
3.96ct Boulder Opal
10.80mm x 9.90mm x 4.33mm
USD 23.76
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ID: 3218391 pcs
26.23ct Boulder Opal
23.22mm x 17.01mm x 9.46mm
USD 183.61
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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: 4207471 pcs
8.57ct Boulder Opal
21.92mm x 10.12mm x 4.47mm
USD 51.42
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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: 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: 3652521 pcs
10.04ct Boulder Opal
15.22mm x 12.06mm x 6.30mm
USD 70.28
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ID: 2408211 pcs
6.63ct Boulder Opal
18.57mm x 10.78mm x 4.53mm
USD 46.41
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ID: 3652421 pcs
9.92ct Boulder Opal
17.00mm x 11.44mm x 6.09mm
USD 69.44
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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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ID: 4206301 pcs
8.61ct Boulder Opal
15.68mm x 10.56mm x 6.05mm
USD 51.66
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ID: 4207491 pcs
10.89ct Boulder Opal
16.93mm x 12.57mm x 5.73mm
USD 65.34
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ID: 3004501 pcs
33.36ct Boulder Opal
28.14mm x 19.04mm x 7.02mm
USD 233.52
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ID: 3652231 pcs
13.52ct Boulder Opal
26.49mm x 11.81mm x 6.01mm
USD 94.64
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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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