Onyx is one of the most visually striking natural stones used in countertops, prized for its translucency and dramatic banding, but it is also one of the softest and most delicate. Caring for and restoring onyx requires a gentler approach than more common countertop stones like granite.
Why Onyx Scratches and Etches So Easily
Onyx is softer than marble and significantly more reactive to acid, which means everyday kitchen use — citrus, wine, even some soaps — can etch it faster than most other stones. Its softness also makes it more prone to scratching from abrasive scrubbing or gritty cleaning pads.
Daily Care Recommendations
Onyx should be cleaned only with a soft cloth and a pH-neutral stone cleaner, avoiding any abrasive pads, powders, or acidic products entirely. Because of its fragility, onyx is more often used for accent surfaces, backsplashes, and bar tops than heavy-use kitchen prep areas.
Restoring Etched or Scratched Onyx
Professional restoration of onyx uses much finer, more controlled honing steps than typical marble or granite work, given how easily the surface can be over-worked. Polishing then restores its signature translucent glow, and a sealer suited to onyx's density helps protect it going forward without dulling its natural light-transmitting quality.
When to Call a Specialist
Given how delicate onyx is, DIY restoration attempts carry real risk of making damage worse. Diamond Stone Restoration has experience with onyx's specific handling requirements and evaluates each piece individually before recommending a restoration approach.