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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (156): 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 - 6.8ct Round Cabochon (ID: 503151)

Round Multicolor Opal

6.8ct
15.6 mm
$ 276.90
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4 pcs
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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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Orange Opal Gem - 1.1ct Round Cabochon (ID: 478962)

Round Orange Opal

1.1ct
8.1 mm
$ 28.94
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4 pcs
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Yellow Opal Gem - 0.5ct Round Cabochon (ID: 477541)

Round Yellow Opal

0.52 ct (total 2.09ctw)
6 mm
$ 44.54
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5 pcs
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Multicolor Opal Gem - 0.8ct Round Cabochon (ID: 466389)

Round Multicolor Opal

0.81 ct (total 4.06ctw)
7 mm
$ 113.68
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6 pcs
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Multicolor Opal Gem - 1.1ct Round Cabochon (ID: 466390)

Round Multicolor Opal

1.07 ct (total 6.39ctw)
6.9 mm
$ 178.92
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4 pcs
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Multicolor Opal Gem - 0.3ct Round Cabochon (ID: 478462)

Round Multicolor Opal

0.29 ct (total 1.17ctw)
4.8 mm
$ 40.95
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Reddish Orange Fire Opal Gem - 1.2ct Round Facet (ID: 511811)

Round Orange Fire Opal

1.2ct
7.6 mm
$ 31.86
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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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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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3 pcs
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Multicolor Opal Gem - 0.3ct Round Cabochon (ID: 478455)

Round Multicolor Opal

0.34 ct (total 1.01ctw)
4.8 mm
$ 35.35
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4 pcs
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Multicolor Opal Gem - 1ct Round Cabochon (ID: 466423)

Round Multicolor Opal

0.96 ct (total 3.84ctw)
6.9 mm
$ 107.52
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Orange Red Fire Opal Gem - 1.2ct Diamond-Cut (ID: 369575)

Round Red Fire Opal

1.2ct
8.4 mm
$ 39.56
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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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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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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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Orange Red Fire Opal Gem - 1.2ct Round Facet (ID: 369572)

Round Red Fire Opal

1.2ct
7.6 mm
$ 39.89
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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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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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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
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.
Certified Customer Reviews
Overall Rating -> 10 star ratings
man their gems are pretty good, and the prices aren't to bad either, I like checking out hte gems on there website, beceause the pictures of the gems are taken pretty well, and you can see the table, and the facets.
Posted By Spinach in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I love gemselect and I have bought a fair amount from them. The only complaint I have is not being able to save gems. I have a lot of projects so i am in the market for a lot of different gems and it's so disappointing to have to delete them all just to purchase one or two that I have saved in my cart.
Posted By S.Hicks in March, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
I always check this site because they have unique options.
Posted By Lisa in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
Great website to navigate. Awesome Gem selection! Nice photos and discriptions for all of the gems for sale. You can find gems in all price ranges. Checkout was a breeze.
Posted By Timmy in February, 2019
Source: Bizrate
Overall Rating -> 10 star ratings
They had an extensive gemstone selection in all different cuts, sizes, and colors. They also had very good and workable prices. All of these aspects pulled me in as a customer.
Posted By Josh in February, 2019
Source: Bizrate
Overall Rating -> 9 star ratings
It all depend on the product I will receive and have it verified by my in law jewellers.
Posted By Vodka in February, 2019
Source: Bizrate
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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