it is starphire glass, on the sides and front, my lfs sells these and their new store has one set up with giesemann 48" over it and the matching oceanic stand, they look truly amazing with the a hanging light, such a clean look. They look best without a canopy imo, european style.
I also love the overflow cover to prevent light getting in. the carry a hefty price though, but well worth it in my opinion.