How can you tell how old costume jewelry is?

To tell how old costume jewelry is, first look for identifying marks. You can then use trusted online resources to determine who made the piece. Once you know the maker, you can then research their designs to try and estimate the age. The best way to determine how old a piece of costume jewelry is would be to consult a knowledgeable appraiser or antique jewelry dealer for assistance with dating the accessory. On 1stDibs, explore a collection of vintage and antique jewelry.