Is onyx expensive?
Matthew Wilson
Updated on January 19, 2026
Onyx is an inexpensive gemstone and can be found to suit any budget. This makes it perfect for costume jewelry as well as large statement pieces. Onyx pairs well with expensive materials like the diamond and gold of this ring.
How much is an onyx worth?
Black onyx can vary in value from $1 to $500 per carat on its own. That varies with the setting of the gemstone itself. With a setting of silver, it'll be less than a setting of yellow or white gold.Is onyx a precious stone?
Vintage and antique pieces containing onyx are usually quite valuable, as are some fine mixed gemstone pieces. Value increases dramatically when the stones are showcased in precious metal settings, including yellow, white, or rose gold; platinum and other precious metals are also used in setting fine onyx.How can you tell a real onyx?
Check your black onyx for parallel bands.
- Check your black onyx for parallel bands. Even if it appears to be a solid color, you may still be able to see some sort of parallel bands running through the stone.
- If it has bands, it's probably real black onyx.
Is onyx a rare gem?
Onyx is relatively uncommon in nature. It is the striped, semiprecious variety of agate with white and black alternating bands.** THE MOST EXPENSIVE E-BIKE EVER! ** - Is It Actually Worth It?
Is onyx a diamond?
While onyx is similar to black diamonds in appearance, it doesn't have the hardness that black diamonds do. It has a ranking of 6.5 to 7 on the Mohs scale, making it quite a soft gemstone.Is onyx a marble?
Onyx is actually a type of marble and it has many of the same properties. The difference is the stunning patterns and veining in each slab. Onyx comes in varying degrees of patterns and a rainbow of stunning colors.How can you tell fake onyx?
To test your black onyx piece for authenticity, use a lighter and gently heat the surface of the stone for 10 seconds before dropping into a glass or bowl of water. If the stone remains unchanged, there's a good chance it's the real deal. If the piece appears melted or damaged in any way, it isn't black onyx.Does onyx scratch easily?
Since onyx is a stone that can scratch, chip or crack easily, make sure you avoid hitting or bumping your onyx ring or other jewelry when wearing it.Is onyx man made?
Imitations and treatmentsThe majority of carved items sold as "onyx" today are this carbonate material. Artificial onyx types have also been produced from common chalcedony and plain agates.