Is signed vintage jewelry more valuable than unsigned pieces?
It really depends on the designer. Some jewelry designers, I’m talking antiques now, never signed their pieces but they are still valuable when identified by a qualified appraiser. If a designer usually signs their work, and didn’t stamp a piece it could be worth more because of the faux pas. Generally for a respected jeweler, a signed piece is an identification as well as a sign of authenticity. Remember to have it scrutinized by an expert before claiming you have an authentic piece.