Diamond grinding is the mechanical process of removing the damaged top layer of a stone floor with diamond abrasives and polishing it back to a uniform gloss. It is the only method that can correct lippage (uneven tile edges), deep scratches and heavy surface wear, because it cuts the stone instead of coating it.
Grinding happens in steps, never in one pass. A typical restoration on Indian marble runs 30, 60, 120, 200 and 400 grit as metal-bond or coarse resin diamonds, then 800, 1500 and 3000 grit resin pads for the polish. Every step removes the scratch pattern of the previous one. Skipping a grit leaves swirl marks that appear under low-angle light - the most common reason a polished floor still looks patchy.
If the floor is flat and only the surface gloss has dulled, crystallization or a powder polish restores the finish for far less money. Grinding a sound floor removes stone for no benefit, and we say that at inspection rather than selling the heavier job.
Diamond grinding and polishing in Delhi NCR usually falls between Rs.15 and Rs.25 per sq.ft. The rate depends on total area, how much stone must come off to level the surface, and whether joints need epoxy filling first. Large commercial areas price lower per sq.ft than a single 300 sq.ft flat.
Grinding cannot remove stains that have penetrated the stone body, cannot hide a hollow tile, and cannot make two different stones match. It also removes material each time, so a floor can only be ground a limited number of times over its life.
Does it create a lot of dust?Water-fed machines are used, so slurry is captured instead of going airborne. Furniture is moved and covered by our crew.
How long does a floor take?A 1,000 sq.ft flat normally takes one to two working days, including drying before handover.
Will it look like new?Where the damage is in the top layer, yes. Where the stone itself is stained or mismatched, the improvement is partial and we say so at inspection.
See also crystallization and silicate treatment and methods compared.
