Felhandler/ Steeneken Architects The floor is imported French limestone slab material cut into about 16" squares. They were custom cut to size by the stone installer. The cabochons are a dark marble with a honed finish. I don't remember the exact types of the stones but since slab material changes all the time as they reach different parts of the quarry, it wouldn't probably help to know anyway. You just need to go to a large marble importer's yard and pick what you like with your installer.
The walls are not tiled, it's a Stuc Pierre finish meant to replicate French limestone.
First impressions are lasting ones. When you step foot in this entryway it should speak volumes of His Royal Highness and his Leading Lady. Make understated elegance the overall theme for the royal residence.