We had a similar problem during snagging of our quad, Jose who works for Taray drilled a large whole in the tile much to my amazement!! and filled it with Marble resin then went off had a smoke came back with what looked like a sanding pad after 5 mins rubbing job done he told me after a few mops it would blend ok (hand signs) he was spot on you can't notice it unless you get down and point it out!!!!
PS. I gave him €5 he was pleased as punch!
Bravo Jose