Hi Ali,
Thanks for the question and nice words. The shower is clad in Sinfonia Classic Marblestone by Kerlife.
https://kerlifegrupo.com/series/classic-marblestone/
They are large format tiles, at 36" x 36".
Best,
Jeff Fiorito, Allied ASID
https://jefffioritointeriordesign.com/
Fiorito Interior Design