They can't be in molten glass I don't think. I think they will be like mine. A beautiful optic dome of glass, with a hollow underneath.made separately, Then when cold filled from the base with whatever decoration is chosen, and sealed closed with felt base. Will look in the shed for mine and post some photos. May be a day or two. Getting hot again. Not good to be fossicking in a tin shed when it is 100f 🌞
Jackie.