I'm pretty sure it's tile, given how you can see the mirrors and faucets reflected in it, but I'd also love to know the brand/color. I've searched for arabesque glass tiles and haven't found anything in this color.

It looks like what I am putting in my kitchen, which is Highland Park, Portico Pearl.

I have this tile in white gloss in my kitchen. I'ts a glass tile.

It is an Arabesque shape available online from The Builder Depot. It is a spectacular installation. An incredible look together with the Bianco Carrara Vanity amazing.

Hopefully this helps a few people with a direct place to go. I would recommend a sample first of the Dove Gray and the Gray mist prior to buying. It ensures what you order is what you get.

A lot of other options. With a bigger format of Arabesque.

Thank you so much for sharing this info!