Of all the steps in making a marble homeware piece — selecting the stone, cutting the rough form, carving the shape, grinding through the abrasive sequence — polishing is the one that separates a good piece from an exceptional one. It is also the step that is hardest to shortcut. Here is how it is done.

Why Polishing Matters More Than Any Other Step

A marble piece that has been well-carved but poorly polished looks unfinished. The stone's depth, translucency, and colour saturation — the qualities that make natural marble worth buying — only become fully visible when the surface has been refined to a near-mirror finish. An onyx piece that has been polished correctly glows. The same piece with a matte or semi-polished finish looks like a rock. The polishing step is where the material becomes the object.

The Abrasive Sequence

Professional marble polishing is a progressive process. It begins with coarser abrasive grits — typically starting around 50 or 80 grit — which remove the surface irregularities left by the grinding stage and begin to smooth the stone at a macro level. The piece is then worked through progressively finer grits: 120, 220, 400, 800, 1500, and finally 3000 grit or finer for the highest-quality finishes.

Each stage must be completed fully before moving to the next. Skipping grits — jumping from 220 to 1500, for example — leaves sub-surface scratches from the coarser grit that become visible under the final polish as a haze. This is a common source of quality inconsistency in mass-produced stone products. Our artisans work through every step in sequence, inspecting the surface under raking light between stages to confirm the previous grit's marks have been fully removed.

Polishing Compounds

After the abrasive sequence, a fine polishing compound — typically an oxalic acid-based powder or a diamond-impregnated paste, depending on the stone type — is applied with a soft cloth or felt pad and worked in circular motions across the surface. This final step fills any remaining micro-scratches and brings the surface to its full reflective depth. The difference between a 3000-grit abrasive finish and a compound-polished finish is subtle but visible: the compound finish has a depth and clarity that the abrasive finish alone does not achieve.

Hand Polishing vs Machine Polishing

Industrial marble polishing uses angle grinders with polishing pads — fast, consistent, and well-suited to flat surfaces like floor tiles. For the curved, carved, and three-dimensional forms that make up Artreestry's product range — the rounded interior of a mortar, the base of a chess piece, the curved body of a candle holder — hand polishing with cloth and compound is the only method that reaches every surface correctly. A machine cannot follow the curve of a chess piece's torso or the interior radius of a mortar's bowl with the sensitivity required to produce an even finish. Our artisans do this by feel, guided by how the light moves across the surface as they work.

Reading the Light

The test for a completed polish is simple: hold the piece under a raking light source — a single lamp at a low angle — and rotate it slowly. Any remaining scratches, haze, or uneven sections will be immediately visible as dull patches or directional marks. Our quality check at the polishing stage uses exactly this method. A piece that passes this test under raking light will hold its finish indefinitely under normal conditions.

Read more about the complete making process in our From Mountain to Mantelpiece guide, or browse the finished results across our full collection. Use code ARTREE10 for 10% off your first order — free shipping on all orders over $100.