No one needs GOUT! ;-)

Most of these mosaics do get grouted ... it isn't easy. Yes, use a wet saw with a blade for glass tile.

As far as the mosaic, I don't think the beige tiles complement the green and white glass tiles at all. If that is your counter in the photo, you are pairing 2 very busy elements together, which usually doesn't work that well.

IIRC, you need to be careful with the grout choice for a glass tile.

I've had gout. You don't want it.

Glass has it's own installation techniques. cutting, setting, grouting, edge finishing and adhesive requirements. These will vary with the specific glass you select. I suggest hiring a tile setter experienced with glass.

Chi spa I don’t understand the beige tile. There is no beige tile.