Aloha and thank you for asking about this amazing bath; it was a fun project!
There is no marble but here are the included materials:
The floor is a natural stone, black quartzite. The client loves the dark color and the uneven texture. We brushed the tiles that were used in the shower in order to provide additional slip co-efficiency.
The lower walls are a polished porcelain basalt, a dark grey high polished tile.
The upper walls are a honed and filled vein-cut silver travertine.
The accent backlit "sun" is a custom artist's cast glass with LED lighting.
Thank you again for your interest in our project photos :-)