Sounds like this installation was done with sanded grout? If that's the case, we always warn the client up front that there is a chance the sand will break loose from the grout joint and scratch the marble (leave a swirling scratch pattern)... it can't be avoided... there is always a chance. If this is the case, I wouldn't recommend using diamonds to repair the problem... too aggressive (unless you are very careful with a hand polisher and 4" diamonds avoiding the grout joints).... although on occassion we have used the diamond hand pads to remove deep scratches and/or etches. Honing powders are less aggressive and usually our choice when marble, limestone or travertine is installed with sanded grout and in need of restoration... but you still run the risk of the sand getting under the pad and scratching... we let the client know this in advance. Perhaps you could talk the client into letting you put a honed finish on the marble? Put some enhancer on the stone to bring back the color after honing? This would make the marble easier to care for and would show less surface damage in the way of scratches and etches.
Did you use a floor machine to buff the excess sealer off the floor? If so, this is probably where the sand got under the pad and created the scratch pattern you are seeing.
Are you the only company to ever care for the floor? Are these scratches pre-existing? Was there a topical coating hiding these scratches before you cleaned? These are just a few of the questions I'm asking myself when I read your post.
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