Marble vanity with an integrated veined stone basin between wall sconces

Marble, Travertine or Onyx: Choosing the Stone for a Bathroom Basin

August 29, 20262 min read

People usually choose a stone by looking at it. That works, up to a point. Where it stops working is six months later, when the basin has been used every day and the stone has started to behave like itself.

We carve in three families of stone, and they are genuinely different materials. Here is what each one does.

Marble

Marble is limestone that has been recrystallised under heat and pressure. That process is what produces the veining, and it is also what makes marble denser and harder than the limestone it started as.

In a basin, marble gives you the strongest pattern and the crispest edges. Calacatta, and particularly Calacatta Viola, are the statement stones: white ground, heavy veining, no two pieces the same. Darker Marmara and black marbles are quieter and hide water marks better.

The weakness is acid. Marble is calcium carbonate, so anything acidic reacts with it chemically. Lemon juice, vinegar, most limescale removers and some cosmetic products will etch the surface, leaving a dull mark that is physical damage rather than a stain. It cannot be cleaned off. On a flat worktop it can sometimes be polished out; on a curved bowl it usually cannot.

Travertine

Travertine forms at mineral springs, and the natural cavities in it are the giveaway. Those voids are filled and polished during finishing, and small filled points stay visible in the surface. That is characteristic of the material and is not a fault.

Travertine is softer and slightly more porous than marble, so it wants the same sealing routine a little more often. What you get in return is a much quieter stone. Variation between blocks is far lower than in figured marble, which is exactly why it is the stone we recommend for commercial and hospitality projects where forty basins have to look like each other.

In a home, travertine is the forgiving choice. Its matte, warm surface hides water marks well and it does not fight with tile or joinery.

Onyx

Onyx is a banded calcite, and at the wall thickness we carve it is translucent. Put a light behind or above a honey onyx bowl and the light comes through the stone. Nothing else in the catalogue does that.

It is also the most delicate stone we work with. It is softer than marble, more porous, and it shows etching and staining more readily than anything else on this page. Onyx belongs in a guest cloakroom or a display bathroom, not in the family bathroom that three children use before school.

Which one for which room

Family bathroom, heavy daily use: travertine or a darker marble. Both take the traffic and neither shows every water mark.
Guest cloakroom: anything. It is the room where a statement stone earns its price, because it is seen more than it is used.
Principal bathroom: figured marble, if you are prepared to wipe it dry and keep acidic products off it.
Hotel or restaurant washroom: travertine, with a written cleaning protocol. See our commercial page for the specification detail.
Feature or display piece: onyx, lit from behind.

The maintenance is the same in shape, different in frequency

All three stones want the same three habits: a pH-neutral cleaner, drying after use, and re-sealing every six to twelve months. Onyx and travertine sit at the shorter end of that window, dense marble at the longer end.

What none of them tolerate is acid. If you take one thing from this article, make it that: no vinegar, no bleach, no descaler, no acidic bathroom spray. On natural stone those products cause damage that no amount of cleaning afterwards will reverse.