As you may have guessed, onyx is a somewhat fragile stone. It can become scratched and etched if used in a busy kitchen. Onyx countertops are best suited to parts of a kitchen that don’t see much heavy use.
High-end restaurants and resorts employ onyx bar tops to bring brilliance into a space, an effect that is made even more spectacular when the stone is backlit. Onyx is also used as a backsplash, vanity, or as accent tiles.
Onyx isn’t limited to slabs though. It can be formed into basins, lighting fixtures, or tabletops. One of the most extraordinary qualities of onyx is its ability to radiate light. Any application that takes advantage of this quality is sure to make a beautiful statement.
Link by: https://usenaturalstone.org/the-mystique-of-onyx/