Hi aimeelou2002, Stunning tiles! Either grout option would work. The darker will really make the tiles the feature in the room. Personally I'd probably go the softer grey however, the tiles will still pop as the light grey will still contrast against the brilliant white, but not be so dramatic as the charcoal which will appear black against the White (especially if everything else is white /muted). Good luck with your decision, and I'm sure it will be beautiful whatever you choose!

Thanks everyone for their comments! Update: husband has 'over-ruled' on this one. Forgot to mention that the vanity top will be Night Sky Ceaserstone (ie black). So he wants the dark grout. We will definitely be using mould inhibitor and ensuring everything is well sealed. It's all his fault if it looks horrible ;) Will post photos once fully complete. (I am now a little scared...)

It's a lovely tile! I'd go light-mid grey (basically like the picture!), if you go dark then it's pointless having the interesting hexagonal shape and the veins will look a bit odd stopping and starting, and if you go too light it will compete with the veins in the marble and look to busy.

My subway tiles are hand made Spanish tiles. I don't know what you mean by textured artisan tile?? I have used white grout. Our home is nearly six years old, and the grout is still white. I always rub a cloth over tiles if I have used the cook top. Keep it clean after cooking, and then it can't get dirty.