today I bought a tiffany lamp at good will and it looks like some of the glass pieces have seperated from each other does anyone know a good way to fix this?

seperated pieces (below):

shade design (below):

whole lamp (below):

if needed I can take more pictures

some more info:

the lamp is from the 1950's/1960's the light socket and wiring aren't original and have been replaced sometime in the past this is not genuine tiffany however it is vintage and worth about $229