You can use a stone sealer or a product called grout release. Either way, do it before you grout. Stone is porous and will absorb the grout color if you're not careful.
Personally, I would recommend a nice ceramic or porcelain tile over stone. No sealers are needed except for the grout, which I would suggest for kitchen/DR use.
You might also consider a laminate floor. Like ceramic and porcelain tile it is very easy maintenance. Advantages over tile are easier installation and warmer under foot.
Is your subfloor wood or slab?
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