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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (36): Round Opal Gems Fire Opal, Moss Opal, Opal, Opal Doublet, Boulder Opal, Chocolate Opal, Black Opal Clear All
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ID: 3696761 pcs
thumb image of 4.7ct Diamond-Cut Reddish Orange Fire Opal (ID: 369676)
4.74 ct Fire Opal
12.3 mm
$ 153.72
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ID: 4320471 pcs
thumb image of 0.6ct Round Cabochon Multicolor Opal (ID: 432047)
0.63 ct Opal
6.4 mm
$ 17.64
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ID: 4508441 pcs
thumb image of 11.3ct Round Cabochon Multicolor Chocolate Opal (ID: 450844)
11.31 ct Chocolate Opal
16.2 mm
$ 498.43
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ID: 4542171 pcs
thumb image of 0.8ct Round Facet Orange Fire Opal (ID: 454217)
0.81 ct Fire Opal
7 mm
$ 21.34
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ID: 3832351 pcs
thumb image of 0.8ct Round Facet Reddish Orange Fire Opal (ID: 383235)
0.78 ct Fire Opal
6.8 mm
$ 24.98
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ID: 4544735 pcs
thumb image of 2.6ct Round Facet Orange Fire Opal (ID: 454473)
2.57 ct Fire Opal
6.1 mm
$ 67.69
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ID: 3652311 pcs
thumb image of 15.1ct Round Cabochon Multicolor Boulder Opal (ID: 365231)
15.09 ct Boulder Opal
16.4 mm
$ 105.63
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ID: 3694931 pcs
thumb image of 2ct Round Facet Reddish Orange Fire Opal (ID: 369493)
2.00 ct Fire Opal
8.9 mm
$ 64.86
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ID: 3834231 pcs
thumb image of 0.8ct Round Facet Reddish Orange Fire Opal (ID: 383423)
0.84 ct Fire Opal
7.2 mm
$ 26.85
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ID: 3832461 pcs
thumb image of 0.8ct Round Facet Reddish Orange Fire Opal (ID: 383246)
0.75 ct Fire Opal
6.8 mm
$ 24.02
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ID: 3227301 pcs
thumb image of 11.9ct Round Cabochon Multicolor Boulder Opal (ID: 322730)
11.89 ct Boulder Opal
14.9 mm
$ 83.23
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ID: 3915942 pcs
thumb image of 9.4ct Round Cabochon Blue Opal Doublet (ID: 391594)
9.35 ct Opal Doublet
15.2 mm
$ 207.10
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ID: 3832331 pcs
thumb image of 0.9ct Round Facet Reddish Orange Fire Opal (ID: 383233)
0.86 ct Fire Opal
6.9 mm
$ 27.54
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ID: 3029151 pcs
thumb image of 23.5ct Round Cabochon Multicolor Boulder Opal (ID: 302915)
23.48 ct Boulder Opal
21.3 mm
$ 164.36
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ID: 4323651 pcs
thumb image of 0.5ct Round Cabochon Multicolor Opal (ID: 432365)
0.53 ct Opal
5.8 mm
$ 14.84
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ID: 3672164 pcs
thumb image of 2.9ct Round Facet Reddish Orange Fire Opal (ID: 367216)
2.85 ct Fire Opal
6.4 mm
$ 95.05
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ID: 3832251 pcs
thumb image of 0.9ct Round Facet Reddish Orange Fire Opal (ID: 383225)
0.89 ct Fire Opal
7.1 mm
$ 28.50
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ID: 3693651 pcs
thumb image of 3.8ct Round Facet Reddish Orange Fire Opal (ID: 369365)
3.79 ct Fire Opal
11.5 mm
$ 122.91
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ID: 4535311 pcs
thumb image of 12.1ct Round Cabochon Multicolor Boulder Opal (ID: 453531)
12.06 ct Boulder Opal
16.5 mm
$ 252.17
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ID: 4508341 pcs
thumb image of 2.6ct Round Facet Orange Red Fire Opal (ID: 450834)
2.58 ct Fire Opal
10.5 mm
$ 83.67
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ID: 3667911 pcs
thumb image of 0.8ct Round Facet Orange Fire Opal (ID: 366791)
0.77 ct Fire Opal
7 mm
$ 30.03
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Round Opal Gems
More than any other gem, each opal is distinctly an individual. No other stone has as rich and varied a folklore. Opals are also the most delicate gems commonly worn. They require special care to ensure their health and longevity.

Opal's fire was long thought to be the result of iridescence. However, with the advent of scanning electron microscopes, we now know that it is a result of diffraction.

Opal is relatively soft, with a rating of 5.5-6.5 on the Mohs scale. Despite its frequent use in rings, opal is a poor choice for a ring stone; it is much better suited to earrings, pins, and pendants.

Major suppliers include Australia, Brazil, Mexico, and the US. Values are normally determined by the presence and nature of color flashes.

Round opal gemstones are available in singles, matched pairs and gem lots. Round opal gems fit various jewelry designs, whether they are used as center stones or accent stones. Choose from various round opal stones in calibrated sizes, including black opal, boulder opal, chocolate opal and opal doublets. Use the search filters at the top of the page to find the perfect round opal gems by size, carat weight, price or origin. The tick boxes will direct you to singles, pairs, lots, faceted gems or cabs.
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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

Size Comparison Chart