How do you identify vintage costume jewelry?

To identify vintage costume jewelry, you'll need to determine if your piece is between 20 and 99 years old. To do so, see if you can locate a maker's mark. You're most likely to find it in an inconspicuous area, such as an inner edge or a clasp. Using trusted online resources, search for the mark to learn who the maker is, then read more about it to get an idea of when it produced items similar to yours. Alternatively, you can consider having a certified appraiser or experienced antique dealer help identify your costume jewelry. On 1stDibs, find a selection of vintage costume jewelry.