Natural Stone Finishes Explained
The same stone in two finishes can look like two different materials and perform completely differently underfoot. Here is what each finish does, and when to specify it.
Finish is the most consequential decision after material, and the one most often left to the supplier by default. The same andesite honed and bush hammered are, functionally, two different products.
Honed
Ground smooth to a flat matte surface with no reflection. The most versatile finish and the default for interiors and submerged pool surfaces. Shows the stone's true colour without the distortion that gloss introduces.
Slip resistance is moderate dry and poor wet. Do not specify honed on steps, pool decks or any barefoot wet surface.
Polished
Ground and buffed to a reflective gloss. Deepens colour and reveals veining most fully, which is why it is used on marble. It also shows every scratch, etch mark and water spot.
Interior use only, and not in wet areas. Polished marble in a hotel bathroom is a maintenance commitment the operator should agree to knowingly.
Flamed
The surface is heated rapidly with an oxy-fuel torch, causing the outer crystals to spall away and leaving a rough, open texture. Works on hard volcanic stone — andesite and basalt — and not on soft sedimentary stone.
Excellent wet slip resistance, typically R12. The standard exterior paving finish for public and commercial areas. Flaming lightens most stone slightly and increases surface porosity marginally.
Bush hammered
A pneumatic hammer with a pointed head strikes the surface repeatedly, producing an even pitted texture. More controlled and more uniform than flaming, and it works on a wider range of stone.
R11–R12 wet slip. The usual specification for pool coping, steps and barefoot surfaces because it grips without being abrasive against skin — a distinction that matters more than the numbers suggest.
Sandblasted
Abrasive media propelled at the surface produces a fine, even matte texture — gentler than bush hammering and considerably gentler than flaming. Good on softer stone where flaming is impossible and bush hammering would be too aggressive.
Moderate to good slip resistance. Frequently specified on limestone and sandstone where some grip is wanted without losing the material's softness.
Brushed / antiqued
Abrasive brushes work the surface to a soft, slightly undulating texture that reads as gently worn. Warmer and less clinical than honed, more refined than sandblasted. Popular on limestone and marble for interiors where a honed surface would look too new.
Tumbled
Pieces are tumbled with abrasive media until edges and corners round and the surface softens. Produces a deliberately aged appearance. Common on mosaic and small-format tile; the rounded edges also make joint width less critical, which helps on hand-set work.
Split face and natural split
The stone is fractured along its natural cleavage rather than sawn. Not a surface treatment but a method of separation, giving genuinely irregular relief of 10–25 mm. Only for walls — the surface is far too irregular for any floor.
Choosing by position, not by project
| Position | Finish |
|---|---|
| Interior dry floor | Honed |
| Interior wet floor / bathroom | Honed small module, or sandblasted |
| Shower floor | Sliced pebble or small hexagon, unpolished |
| Pool below waterline | Honed |
| Pool steps, benches, coping | Bush hammered |
| Pool deck / terrace | Bush hammered or flamed |
| Public / commercial paving | Flamed |
| Driveway | Flamed or bush hammered, 50 mm |
| Exterior facade, flat | Bush hammered or honed |
| Exterior facade, textured | Split face |
| Interior feature wall | Any — light it accordingly |
The point of that table is that finish is specified by position, not by project. A single pool commonly needs honed, bush hammered and flamed surfaces in three different places, and specifying one finish throughout is how a beautiful pool becomes a slip hazard.
