Product photographers use a curved cove to disguise the transition between floor and wall.
They also use three light sources: a key light, a modeling light and a fill light to modulate shadows. It is important for shiny surfaces to pick up some of this as specular reflection.
You might make your glass have less roughness to emphasis this type of reflection.
It also pays, when doing close views of cast glass, to introduce irregularity through a texture map with reduced opacity. Attached is a map I used in doing my crystal candle holders exercise in my book.
This one is a png because I got frustrated with the 256 k image post limit, but if you write to me, I'llsend you a tiff file with an alpha channel that is better.
Dwight Atkinson