Here is carerra marble with medium grey grout.
Best color grout for marble tile.
If you want to highlight a color or accent in your tile like the gray veins in a marble tile go for a close match or a bit darker than that shade in your tile.
White grout is a risk in bathrooms though as everyone mentions.
Grout especially cement based grout can darken over time especially in high traffic areas.
I absolutely love it but keep in mind this is 3x6 tile so the grout will be more prominent with tiny tiles simply because there s more grout visible compared to a larger tile.
Grout color has a large impact on the appearance of a tiled wall counter or floor.
The light gray is also a fine choice but keep in mind that it will darken and maybe not match the tile color quite as well over time.
Carrera marble tile floor tile grout grout color carrara pietra hexagon that hampton carrara marble backsplash tile grout brushed 2x8 marble tile stone carrara.
Use a non sanded grout to protect both the marble and the grout from discoloring too much.