My flea market lamp looked perfect until I felt the seam
I almost bought a ceramic lamp that seemed fine but had a hidden repair (you know, where it was glued back together). I figured it out by running my finger along the base and noticing a slight ridge. Now I always bring a small flashlight to check for glue lines in the glaze, which catch the light. It saved me from buying a cracked vase just the other day. Another tip is to tap the item gently and listen for a dull sound, which can mean a weak spot. Just be careful with ceramics that look too good to be true, and inspect them closely.