Our design team suggest you use Grout colour 45 Mink, as a subtle grout line.
For a more lifted look, we suggest Grout colour 44 Greige. This complements the lighter tones within the tile.
Recommended Grout Joints - (We have assumed that your substrate has a perfectly flat and plumb surface, please check with your tiler.)
4mm grout joint. Based on this joint size, 1 bag of grout would cover 6.7m².