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Buy Round Opal Gems

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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (168): Round Opal Gems - Fire Opal, Moss Opal, Opal, Opal Doublet, Boulder Opal, Chocolate Opal, Black Opal Clear All
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Multicolor Opal Gem - 1.6ct Round Cabochon (ID: 466303)

Round Multicolor Opal

1.55 ct (total 6.18ctw)
7.9 mm
$ 173.04
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1 pc
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Orange Opal Gem - 1.1ct Round Cabochon (ID: 478962)

Round Orange Opal

1.1ct
8.1 mm
$ 28.94
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1 pc
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Multicolor Opal Doublet Gem - 2.6ct Round Cabochon (ID: 505377)

Round Multicolor Opal Doublet

2.6ct
11.2 mm
$ 69.09
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1 pc
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Multicolor Chocolate Opal Gem - 11.3ct Round Cabochon (ID: 450844)

Round Multicolor Chocolate Opal

11.3ct
16.2 mm
$ 499.99
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4 pcs
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Multicolor Black Opal Gem - 1.2ct Round Cabochon (ID: 473268)

Round Multicolor Black Opal

1.23 ct (total 4.91ctw)
8.2 mm
$ 102.77
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1 pc
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Reddish Orange Fire Opal Gem - 1.2ct Diamond-Cut (ID: 369575)

Round Orange Fire Opal

1.2ct
8.4 mm
$ 39.56
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1 pc
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Multicolor Boulder Opal Gem - 15.1ct Round Cabochon (ID: 365231)

Round Multicolor Boulder Opal

15.1ct
16.4 mm
$ 105.63
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1 pc
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Multicolor Boulder Opal Gem - 23.5ct Round Cabochon (ID: 302915)

Round Multicolor Boulder Opal

23.5ct
21.3 mm
$ 164.36
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1 pc
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Multicolor Opal Gem - 6.8ct Round Cabochon (ID: 503151)

Round Multicolor Opal

6.8ct
15.6 mm
$ 276.90
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5 pcs
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Multicolor Opal Gem - 1.7ct Round Cabochon (ID: 466386)

Round Multicolor Opal

1.68 ct (total 8.39ctw)
8 mm
$ 234.92
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1 pc
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Reddish Orange Fire Opal Gem - 1.2ct Round Facet (ID: 369572)

Round Orange Fire Opal

1.2ct
7.6 mm
$ 39.89
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1 pc
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Multicolor Opal Doublet Gem - 1.8ct Round Cabochon (ID: 505383)

Round Multicolor Opal Doublet

1.8ct
10 mm
$ 46.94
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1 pc
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Multicolor Opal Doublet Gem - 4.2ct Round Cabochon (ID: 505378)

Round Multicolor Opal Doublet

4.2ct
13.2 mm
$ 111.02
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1 pc
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Orange Fire Opal Gem - 2.7ct Round Facet (ID: 450835)

Round Orange Fire Opal

2.7ct
10.5 mm
$ 88.86
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5 pcs
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Multicolor Opal Gem - 1.7ct Round Cabochon (ID: 466382)

Round Multicolor Opal

1.67 ct (total 8.36ctw)
8.1 mm
$ 234.08
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2 pcs
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Yellow Opal Gem - 0.7ct Round Cabochon (ID: 477369)

Round Yellow Opal

0.66 ct (total 1.31ctw)
6.1 mm
$ 27.92
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2 pcs
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Yellow Opal Gem - 0.7ct Round Cabochon (ID: 477403)

Round Yellow Opal

0.65 ct (total 1.30ctw)
6.1 mm
$ 27.70
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4 pcs
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Multicolor Opal Gem - 2.1ct Round Cabochon (ID: 466302)

Round Multicolor Opal

2.07 ct (total 8.26ctw)
9 mm
$ 231.28
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1 pc
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Multicolor Black Opal Gem - 2.2ct Round Cabochon (ID: 473928)

Round Multicolor Black Opal

2.2ct
9.1 mm
$ 45.00
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1 pc
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Multicolor Opal Doublet Gem - 5.8ct Round Cabochon (ID: 505381)

Round Multicolor Opal Doublet

5.8ct
16.4 mm
$ 154.00
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6 pcs
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Multicolor Opal Gem - 1.4ct Round Cabochon (ID: 466393)

Round Multicolor Opal

1.36 ct (total 8.15ctw)
8.1 mm
$ 228.20
Item in Stock
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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