Would be best for you to get a grout sample deck and take home within your own lighting to choose the grout. Lighting makes a world of difference and a sample board that you lug around will look different in one place vs your home.

Thanks so much! I did that and still couldn't decide - had to give it 24 hrs to see what it looked like during various parts of the day. I'm too impatient and really didn't want to wait. Was hoping someone else had installed it and could just recommend a grout color or number, lol! I went with light-to-medium gray. It was just tough with all the different colors in the tile. Thank you again so much for your response!

Looking at the sample in my showroom my personal selection of grout was #543 Driftwood from Custom Building Products. It's a light gray with a hint of green which could help compliment the glass tile. But that's me.

I bet that was beautiful! The gray that I chose brought out the blues, but I would have much preferred the greens. Great advice, thank you!

Glad you were able to make a selection.