grouting for topps black galaxy quartz sparkly tiles

[kev]

I'm about to fix a floor and wall in a bathroom with 300 x 300 black quartz tiles from topps, just after some opinions on grout, I'm thinking either 4mm with mapie manhatten to make them stand out , or would it be better to go 2mm with a charcoal ? What kind of combination have others used and did it look ok ?

 

[Marksmithtiling]

I have done a kitchen and bathroom floor with similar quartz from N&C, both with 4mm and used N&C black grout. They both wanted the "sparkle" to stand out from the black background if that makes sense. Test the grout on a waste tile first ,BAL charcoal scratches ,

 

[troweler]

I've done both the brown and the grey in 3 mm looks perfect I think definately black grout.

 

[charlie1]

1mm with black looks good, both a mix of red and black tiles. I've never used any lighter grout with the black tiles