The pot filler faucet is a Grohe. I'm not sure if they still sell this exact model/handle style (it matches our Ladylux Cafe Grohe faucet; both were purchased/installed in 2007). The finish is SS. I never remember which of their finishes is actual SS (I think there are two with steel in the name?), but you can call Grohe USA to find out. Our tile guy used TEC Accucolor(?) Bright White grout; a mix of sanded and unsanded (I don't recall the ratio). AquaMix Gold sealer was used. This was in 2007. If we were doing our backsplash today, we might use TEC XT (XT is more stain/crack resistant--we used it in our MB and hall bath), though ours is holding up beautifully. Right over the range vent (island height trim) is the only place that acquires stains, and requires scrubbing (from vented steam, grease from the oven). Since I started deflecting the vented steam away from the backsplash with a piece of foil (while using the oven), there's rarely anything to scrub. (Our backsplash elsewhere seems to stay even cleaner. :))

I too couldn’t find photos of glass tile with gray grout. All the photos I found had white grout. To add to my dilemma, the glass tile is textured. I’m currently renovating our bathroom and my designer suggested it. I’m not sure about it.

Check out Fireclay Tile- lots of glass subway tiles in many colors and sizes.

Prob happened when he installed the hood. Call him out and ask him to replace the one tile. (you have extras, yes?) Or, just leave it as is. it's really not noticeable. to fix it will mean removing that entire hood It's not like a windshield. it won't spread to others.