I'm also thinking pewter, but you would be the better judge because I assume you can see both items in person rather than on a monitor.

Restoration Decor has it right! Choose what matches the tile color best.

It also appears to me that pewter is closest in color to the tile.

Pewter, then Alabaster. how about a different grout company??

It's called "Biscuit". A standard color, that works with everything. Try it.

Beth's Oyster Gray might work. There are also some manufacturers that have blue colors.

Thanks for the input everyone! We looked and found a different grout brand, Bostik, and chose Aquamarine.

I'd go for the silver or moonstone or even onyx. you may tire of the blue one.

to me its between, platinum or pewter.

How did the aquamarine turn out?

Hi Erica. I have chosen Montgomery for my kitchen counters and small island. Can you please tell me manufacturer and name of yout backsplash tile? I am stumped for mine so would very much appreciate it,

Hi Lizzy, We got our backsplash tile from Floor and Decor. The name is called Pure Spa Blue. Here is a link to it: https://www.flooranddecor.com/deco-glam/spa-blue-shiny-stick-glass-mosaic-913102141.html#q=Spa%2Bblue&start=8

They have other styles and sizes in the same blue color, so you can compare and see what you like best. Here is a link that shows the other styles:

https://www.flooranddecor.com/search?q=Spa+blue

Also, Cambria suggested for Montgomery a tile from The Tile Bar in the color Aspen Aura, which has more of a greenish hue than the blue that we were looking for.

Hope this helps and that you find one that you like! Would love to see the finished product :)