I don’t think there is much chance of doing this with a visible light ssl or diode. My co2 is not effective on stone to any usable degree.
It won’t do much on porcelain tile either, as it’s glass and just passes through that… give it a try…
There is the Norton Tile Method for tile, uses paint that contains Titanium Oxide (TiO2) that will leave it black when lased by a diode. Then you have to remove the rest of the paint. There is a similar approach with powdered TiO2.
Good luck
