Glue for porcelain ornaments?

If you are sticking porous items to porous items, use plain old white glue (like Elmer's) or a tacky white glue (like Aleene's.) If you are sticking non-porous items to porous items, get a jewel or gem glue. They're made to use with rhinestones, and stick non-porous and porous items together very well. All of these are available at your crafts supplies store.