How to Tell if an Opal Is Fake

Last Updated: February 23, 2021

Opals are gorgeous stones. But how can you tell if the necklace you bought with your hard-earned cash contains a real opal? Fake opals are often very hard to detect, but here are some tips for making sure your shimmery gemstone is the real thing.

Steps

1
Check the country of origin. Most real opals are mined in Australia, which is the opal capital of the world. Russia and Hong Kong make high quality fake opals that some shady jewelers try to pass off as the real thing. If your opal does not come from Australia then you should seriously suspect its validity.
2
Inspect the symmetry. If the opal is a natural stone, then even with cutting and polishing it may not be entirely symmetrical. If the opal is a perfect circle or oval, then you should have a licensed jeweler inspect it before you make the purchase.^{[1]
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3
Look at the opal in strong, white light. Do not use a fluorescent light, because it can make the opal appear to have more facets than it actually does and can give the impression of additional colors. If the opal seems to have multiple layers of color, then this is a good indication that it is the real thing. However, if an opal only appears to have colors immediately below the surface, it may be a fake.
4
Check the price. A real opal, even a small one, will usually cost over $100. If an opal in a jewelry setting costs only $20 or $40, then you should suspect the bargain.
5
Look closely at the pattern. An opal created in a laboratory (Gilson opal)displays bright colours in large patches of colour. The pattern is often 'too perfect' and ordered, and can also often display a 'snakeskin' pattern.^{[2]
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Community Q&A

Question

I brought an opal that they said was a created white fire opal. Is it real or fake?

Community Answer

It sounds like an opal that was created in a lab instead of dug out of the earth. That does make it less valuable than a mined opal.
Question

If opal has a specific pattern, does that mean it's manufactured?

Community Answer

It is really likely to be a fake with a specific or repeated pattern. Nearly all symmetrical opals are fake; check if it is a perfect circle or oval. Even a small opal is well over $100, so if it's selling for less than this, it's probably manufactured.
Question

Is Oregon peach opal real?

Community Answer

Yes. The opal variety was first discovered in 2016.