Before you try anything: always speak to a professional before cleaning, treating or applying any product to your stone. Every slab is different, and the wrong product can cause permanent damage. Contact us or a qualified stone restorer first.
Quick answer
Most dark water rings on onyx are just moisture that has soaked into the stone, and they fade as it dries over 24 to 72 hours. Keep the area uncovered with good airflow. White rings are mineral deposits, and pale, dull rings on polished stone are etches from the drink, and each needs a different fix.
First, check what you are dealing with
- Darker ring that looks damp: moisture in the stone. It usually dries out on its own.
- White, chalky ring you can feel with a fingernail: mineral deposit from hard water. See the hard water guide.
- Pale, dull ring on a polished surface: an etch from the drink, not water. See fixing etching.
What you need
- Clean dry cloth
- Fan or open window
- pH-neutral cleaner
Step by step
Identify the ring
Look closely: darker and damp-looking, white and chalky, or pale and dull. Each needs a different fix.
Let dark rings dry
Wipe the surface dry, remove anything covering it and let air move over it. Most dark rings on onyx fade within one to three days.
Clean off white deposits
Soften mineral rings with warm water and pH-neutral cleaner, then lift them with a new plastic razor blade held flat.
Deal with what remains
A pale, dull ring that does not change is an etch. Light etches on polished stone can be buffed out with marble polishing powder; see the etching guide.
What not to use on onyx
- Vinegar, lemon juice or "natural" citrus cleaners: they etch onyx.
- Scourers, steel wool and abrasive creams on a polished surface.
- Mixing cleaning chemicals, especially bleach with anything else.
- Hairdryers or heat, which can drive minerals deeper.
- Descalers on acid-sensitive stone.
When to call a professional
Rings that persist after a week of drying and cleaning are worth showing a restorer. Onyx needs a restorer who works with it regularly: it is softer and more fragile than marble and easy to over-polish.
Understanding water rings and marks on onyx
Architectural onyx is banded calcite. It is less absorbent than limestone, but its translucency means a stain can show from both sides of a backlit piece.
Onyx is calcite and usually highly polished, so a drop of lime or wine leaves a dull etch that catches the light immediately.
Onyx needs a restorer who works with it regularly: it is softer and more fragile than marble and easy to over-polish.
Good to know
Rings on polished onyx bars are usually etches from drinks rather than water damage, and need re-polishing by someone experienced with onyx.
Stop it happening again
Whether yours is honey, white, green and pink banded onyx, often backlit, repairing it fixes today's mark; protecting it stops the next one. Our clear Stone Protection Film sits over the surface, so acids cannot etch it and liquids cannot soak in. Onyx is usually polished, so Gloss film is the natural match and keeps its reflective depth. It is installed across Sydney with a 10-year written warranty.
How we protect onyx · Cleaning natural stone · Water rings & marks on every surface