Adren picks up a small fragment of the glass. There seem too much to be a potion vial, although not by much. The glass in flat, none of the pieces showing any of the curvature that you would expect from a vial. The glass seems of high quality, and interestingly, it's silvered on one side, catching the firelight from the bowl.
The floor is made of large square slabs of gray stone. The walls are made from panels of a similar stone, but are adorned with carvings (apart from the smooth spot you noticed earlier). The carvings show scenes of mining and forging, overseen in each panel by a draconic figure similar to the statue that towers over the room.