Recently laid tile lost it's lustre?

I removed as much as the grout haze as I could by simply wiping down. It doesn't look like there is any haze left, but my tiles don't seem as dark and shiny as they did before grouting. I don't think it's leftover grout haze, but even if it was there are squares of marble in the design, so I don't think I can use the commercial haze out. Is there any way to get the shine and color back in my tiles? Should I buff the floor with sheepskin, flannel, or something like that?