While that could be possible based on the character or composition of the stone-I think it may be a light scratch from the metal piece on the leg of the furniture.
Its worth a test-
Sanding it out would with flat abrasives would be tough. I would start with a 120 grit diamond brush and then adjust based on the results.
Write a protective contract limiting liability.
 

On Tue, Nov 15, 2016 at 3:25 PM, Mike M <nulifesc@bigpond.com> wrote:
Looks like crystal damage which means it is very deep. Sanding it out would make a channel. I would do some tests. They might have to change the tiles. 

On 15 Nov 2016, at 9:11 am, stuart rosen <mail@stoneshine.com> wrote:

Chris,
We use diamond or silicone carbide brushes on a Frankfurt Driver.
Seems to work well if you have a stronger machine for deeper scrtaches-

On Mon, Nov 14, 2016 at 11:16 AM, <csantospago@gmail.com> wrote:
Sorry I forgot to attach a picture in the previous email.

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Stu Rosen
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