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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (97): Boulder Opal Boulder Opal Clear All
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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: 4207831 pcs
16.69ct Boulder Opal
24.73 x 12.40 x 6.10mm
USD 100.14
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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: 3717011 pcs
33.93ct Boulder Opal
26.72 x 21.28 x 8.42mm
USD 204.06
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ID: 3029211 pcs
17.33ct Boulder Opal
28.82 x 14.68 x 4.85mm
USD 121.31
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ID: 3004531 pcs
28.58ct Boulder Opal
23.12 x 18.45 x 7.13mm
USD 200.06
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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: 3652521 pcs
10.04ct Boulder Opal
15.22 x 12.06 x 6.30mm
USD 70.28
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ID: 3653121 pcs
4.95ct Boulder Opal
11.31 x 9.20 x 5.63mm
USD 34.65
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ID: 3107381 pcs
6.43ct Boulder Opal
15.03 x 12.10 x 5.62mm
USD 45.01
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ID: 3219271 pcs
31.20ct Boulder Opal
29.45 x 20.55 x 6.40mm
USD 218.40
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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: 4206821 pcs
22.65ct Boulder Opal
29.31 x 12.91 x 7.58mm
USD 135.90
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ID: 3221161 pcs
36.68ct Boulder Opal
21.82 x 21.14 x 10.00mm
USD 256.76
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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: 4206811 pcs
9.90ct Boulder Opal
17.72 x 14.03 x 5.08mm
USD 59.40
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ID: 3219211 pcs
21.32ct Boulder Opal
27.33 x 13.10 x 5.82mm
USD 149.24
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ID: 3030251 pcs
18.34ct Boulder Opal
21.12 x 14.70 x 7.03mm
USD 128.38
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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: 3652421 pcs
9.92ct Boulder Opal
17.00 x 11.44 x 6.09mm
USD 69.44
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ID: 3219301 pcs
36.09ct Boulder Opal
29.80 x 18.50 x 7.30mm
USD 252.63
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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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