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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: 4206341 pcs
thumb image of 9ct Fancy Cabochon Multicolor Boulder Opal (ID: 420634)
9.04ct Boulder Opal
29.06 x 8.23 x 5.10mm
USD 54.24
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ID: 3693951 pcs
thumb image of 5ct Oval Cabochon Multicolor Boulder Opal (ID: 369395)
4.97ct Boulder Opal
11.04 x 9.89 x 5.08mm
USD 34.79
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ID: 3652421 pcs
thumb image of 9.9ct Fancy Cabochon Multicolor Boulder Opal (ID: 365242)
9.92ct Boulder Opal
17.00 x 11.44 x 6.09mm
USD 69.44
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ID: 3219201 pcs
thumb image of 21ct Oval Cabochon Multicolor Boulder Opal (ID: 321920)
21.04ct Boulder Opal
27.85 x 12.77 x 6.45mm
USD 147.28
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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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