Depending on the size of the insert it can be anywhere from sorta conceivable to downright impossible to use diamond pads on an insert. If it is a 12 inch tile, OK. But most inserts are smaller, so the working surface may be too small to fit any rotary pad, even a handheld buffer/grinder. So don't promise what can't be feasibly done.
I'd double check Karen's hunch about sanded grout - pretty darn likely.
But even if it's non sanded, are you aware that just cleaning marble can make previously darkened scratch marks more visible? If the pattern matches your tool, maybe not. But if they resemble foot traffic, it is definitely possible.
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