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Gemtype Color Shape Weight Size Date Clarity Price Origin
You Selected (68): Round Opal Gems Fire Opal, Moss Opal, Opal, Opal Doublet, Boulder Opal, Chocolate Opal, Black Opal Clear All
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ID: 3695741 pcs
thumb image of 1.1ct Round Facet Orange Fire Opal (ID: 369574)
1.08 ct Fire Opal
7.2 mm
$ 35.02
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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
$ 499.99
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ID: 4649344 pcs
thumb image of 1.7ct Round Cabochon Multicolor Black Opal (ID: 464934)
1.65 ct Black Opal
5.1 mm
$ 49.50
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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: 4649474 pcs
thumb image of 1.6ct Round Cabochon Multicolor Black Opal (ID: 464947)
1.56 ct Black Opal
5 mm
$ 46.80
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ID: 3694421 pcs
thumb image of 1.9ct Round Facet Reddish Orange Fire Opal (ID: 369442)
1.85 ct Fire Opal
8.9 mm
$ 60.00
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ID: 3832341 pcs
thumb image of 0.8ct Round Facet Reddish Orange Fire Opal (ID: 383234)
0.83 ct Fire Opal
7.5 mm
$ 26.58
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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: 3834891 pcs
thumb image of 0.9ct Round Facet Reddish Orange Fire Opal (ID: 383489)
0.88 ct Fire Opal
7.4 mm
$ 28.12
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ID: 3694961 pcs
thumb image of 1.1ct Round Facet Reddish Orange Fire Opal (ID: 369496)
1.06 ct Fire Opal
7.5 mm
$ 34.38
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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: 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: 4662984 pcs
thumb image of 2.8ct Round Cabochon Multicolor Opal (ID: 466298)
2.76 ct Opal
6.8 mm
$ 77.28
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ID: 4508351 pcs
thumb image of 2.7ct Round Facet Orange Fire Opal (ID: 450835)
2.74 ct Fire Opal
10.5 mm
$ 88.86
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ID: 4663865 pcs
thumb image of 8.4ct Round Cabochon Multicolor Opal (ID: 466386)
8.39 ct Opal
8 mm
$ 234.92
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ID: 4663825 pcs
thumb image of 8.4ct Round Cabochon Multicolor Opal (ID: 466382)
8.36 ct Opal
8.1 mm
$ 234.08
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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: 4618691 pcs
thumb image of 10.3ct Round Cabochon Multicolor Boulder Opal (ID: 461869)
10.29 ct Boulder Opal
14.2 mm
$ 72.24
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ID: 4663936 pcs
thumb image of 8.2ct Round Cabochon Multicolor Opal (ID: 466393)
8.15 ct Opal
8.1 mm
$ 228.20
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ID: 4663836 pcs
thumb image of 7.7ct Round Cabochon Multicolor Opal (ID: 466383)
7.74 ct Opal
7.8 mm
$ 216.72
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ID: 4663845 pcs
thumb image of 7.3ct Round Cabochon Multicolor Opal (ID: 466384)
7.32 ct Opal
7.9 mm
$ 204.96
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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