Our design team suggest you keep it simple with Grout 08 Cement to highlight the raised pattern colour.
Or for more of a contrast, use colour Grout 06 Light Grey.
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 3.2m².