What kind of glue?
I use E6000 for glass to glass
E6000 or a glass glue!
Have you tried super glue? I would probably start with super glue.
Gorilla Glue,E6000,Epoxy Resin
Try using glue made for glass.
Epoxy resin would be a very good choice.
I think E600 would be a great choice. Its at walmart and craft stores-
Ive used it to flatten glass marbles and fasten glass plates on wooden glass windows to make decorative hangings.
Please have a look at product information to see if it might meet your needs.