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ID: 4206801 pcs
thumb image of 12.8ct Oval Cabochon Multicolor Boulder Opal (ID: 420680)
12.77ct Boulder Opal
18.90 x 12.93 x 6.46mm
USD 76.62
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ID: 4206751 pcs
thumb image of 11.2ct Fancy Cabochon Multicolor Boulder Opal (ID: 420675)
11.21ct Boulder Opal
17.95 x 13.59 x 5.71mm
USD 67.26
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ID: 3219301 pcs
thumb image of 36.1ct Oval Cabochon Multicolor Boulder Opal (ID: 321930)
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)

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length x width x depth,
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