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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (109): Boulder Opal Clear All
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ID: 3695641 pcs
7.09ct Boulder Opal
13.92mm x 11.90mm x 4.88mm
USD 49.63
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ID: 4207771 pcs
16.19ct Boulder Opal
20.35mm x 12.30mm x 7.69mm
USD 97.14
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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: 3004531 pcs
28.58ct Boulder Opal
23.12mm x 18.45mm x 7.13mm
USD 200.06
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ID: 3001271 pcs
10.90ct Boulder Opal
15.95mm x 13.77mm x 6.57mm
USD 294.30
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ID: 3219221 pcs
28.03ct Boulder Opal
27.22mm x 19.56mm x 6.87mm
USD 196.21
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ID: 3107651 pcs
7.27ct Boulder Opal
19.96mm x 9.30mm x 5.54mm
USD 196.29
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ID: 3365761 pcs
15.80ct Boulder Opal
18.58mm x 17.72mm x 5.24mm
USD 110.60
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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: 4206711 pcs
15.56ct Boulder Opal
19.26mm x 14.33mm x 7.80mm
USD 93.36
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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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ID: 3218361 pcs
13.35ct Boulder Opal
21.38mm x 15.00mm x 5.42mm
USD 360.45
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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: 4206321 pcs
8.77ct Boulder Opal
14.13mm x 11.34mm x 6.69mm
USD 52.62
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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: 4207491 pcs
10.89ct Boulder Opal
16.93mm x 12.57mm x 5.73mm
USD 65.34
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ID: 4207321 pcs
8.11ct Boulder Opal
13.34mm x 11.42mm x 5.78mm
USD 48.66
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ID: 3656271 pcs
6.83ct Boulder Opal
13.30mm x 10.91mm x 5.44mm
USD 47.81
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ID: 3652491 pcs
10.40ct Boulder Opal
19.49mm x 12.62mm x 5.66mm
USD 72.80
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ID: 3004541 pcs
20.92ct Boulder Opal
25.45mm x 14.85mm x 6.26mm
USD 146.44
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ID: 3139231 pcs
22.51ct Boulder Opal
26.47mm x 19.55mm x 6.13mm
USD 157.57
Item in Stock
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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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