Mexican Opal Gemstones - Natural Loose Opal Gems from GemSelect

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.

Shop for Mexican opal gemstones in a variety of calibrated sizes, cuts and colors, including white, yellow, orange and red fire opal gems.

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Gemstones A-Z

Buy Mexican Opals Gems

1.23 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 8.9 x 6.8 mm

8.07 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 17.2 x 12.2 mm

1.24 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.6 x 7.1 mm

9.03 carat Green Opal, Pear Shape loose Opal from Brazil, Natural Untreated Gem, 16.3 x 14.9 mm

1.23 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10.8 x 7.4 mm

1.19 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.9 x 6.9 mm

1.3 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 10.1 x 8 mm

1.59 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.1 x 7 mm

1.21 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 7.2 x 5.2 mm

1.85 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gems, 8 x 6.1 mm

1.12 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 10 x 6.8 mm

5.15 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 4.6 x 4.5 mm

1.02 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 8.6 x 6.8 mm

1.19 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 8.9 x 7 mm

1.73 carat White Opal, Pear Shape loose Opal from Ethiopia, Natural Untreated Gem, 11 x 8.8 mm

1.77 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 9.2 x 7.1 mm

3.35 carat Square Opal, loose Certified Opal from Ethiopia, Natural Untreated Gems, 4.1 x 4 mm

8.9 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 24.1 x 13.4 mm

1.69 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11.2 x 8.4 mm

1.42 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 11.2 x 7.3 mm

2.9 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 13.5 x 10.1 mm

9.96 carat Green Opal, Oval loose Opal from Brazil, Natural Untreated Gem, 18.8 x 13.8 mm

1.96 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 10 x 8 mm

1.21 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.9 x 7.3 mm

1.14 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 9.2 x 7.2 mm

1.29 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Gem, 9 x 6.6 mm

0.75 carat Multicolor Opal, Oval loose Opal from Ethiopia, Natural Gem, 8 x 5.5 mm

1.7 carat White Opal, Oval loose Opal from Australia, Natural Untreated Gem, 12 x 8.4 mm

0.34 carat Pear Shape Opal, loose Certified Opal from Ethiopia, Natural Gem, 7.3 x 5 mm

34.61 carat Pear Shape Opal, loose Certified Opal from Australia, Natural Untreated Gem, 33.4 x 24.3 mm

2.64 carat Oval Opal, loose Certified Opal from Australia, Natural Untreated Gem, 12.2 x 9.9 mm

1.56 carat Oval Opal, loose Certified Opal from Ethiopia, Natural Untreated Gem, 10.1 x 8.1 mm

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