looks like carrara marble. 2x12's-custom cut from 12x12 tiles

Yes, this is a beveled ceramic tile that you're seeing for the majority of the shower. The niche features the same basketweave pattern accents as you see as a "rug" on the floor.

I want to do the same thing!!! What color grout did you use for the tile? Is the shower floor the hex minis?

The color of the grout is white, and our in house tile expert believes he has located a very similar beveled tile. He believes that the tile by Adex Mfg. Neri Series, beveled brick mosaic, 2" x 4", white is very similar to the tile seen in this photo. Hope this helps!

Thank you so much