I have an area of floor that I want laying with a 60 cm white tile and then have a 10cm Black tile put in at the meeting of 4 white tiles, I guess you understand. The problem is that the way the thai tradesman lay the tiles is to put all the white down first and then cut the square out once everything is set in the cement then place in the smaller Black one. I am concerned that whilst cutting out the squares using an angle grinder etc, that there will be 'overun' with the blade, leaving cut marks beyond the edge of the square.
My question is therefore, is there a smaller cutting tool on the market used for precision shapes that I can buy? Or should I forget the Black squares? Can I 'etch' a square in the tile with acid? (I am just brain storming here guys, sorry if they are stupid ideas), then lay a thin 'veneer' of black tile in the square hole?
Any ideas? I am out of my depth

and don't want to see a really nice floor ruined with a poor finish.