Marble Floors

You are correct. Stone, like marble and granite, can be polished. This process can be done with specialty chemicals or with diamond discs. The process is very similar to sanding wood; depending on the condition of stone you start with a course diamond disc and gradually make finer. Concrete can also be polished in this fashion.

Marble being much softer than granite is easier to polish; the problem with marble is that it contains calcium which reacts with acid and chelators (found in cleaners - used as a water treatment). Acids could be mild like orange juice or soda; these will etch the marble surface.

As far as sealers go it is best to let the stone "breath". A stone impregnating (absorbs) seal would be fine but you don't want a sealer that sits on the surface like a floor finish.

More than you ever wanted or needed to know.

Sorry I do not have a recommendation for you.