[Stoneseller]

Carmela,

Unfortunately, poorly polished surfaces are fairly common in 12 x 12 tiles. The automated machines in the factory don't have eyes, and human intervention to maintain high quality standards is often absent.
It's a shame the problem was not noticed prior to installation.
In my opinion, you need a polishing powder with some oxalic acid added, or a 5x powder, to pop a nice shine on a less a than perfect hone job. It can be done pretty safely by someone with experience, but could turn into a mess if done wrong.
A mild polishing powder, simple aluminum oxide or tin oxide without any acid, could do some improvement. There are literally hundred of countertop shops in the DC Metro area. You should be able to buy a small amount of polishing powder from almost any of them, if you wish to attempt this yourself.
Pictures would be most helpful.