Probably doable, but for some small features, I imagine getting sufficient flow would be difficult. Molten glass is super corrosive, and the rheological properties vary widely. It's difficult to work with and highly temperature sensitive, all features that just make it a tricky medium.
This is how many custom rings are made today. Of course the material for most rings is some type of precious metal. As for it taking 50 years, I can only say I hope not!
