Dating antique jewelry
From 1956 through 1959, the survey found no examples of screw-back earring findings on the dated Hollycraft pieces.
If attempting to date a pair of earrings with screw-back findings, this information can be used to focus your research to before the mid-1950s.
Prior to the early 1950s, typical necklace clasp styles used by Coro and Trifari were spring ring, push (also known as box), or fold-over.
In the 1950s, a new type of clasp using a hook and extender became popular for costume jewelry necklaces.
Less familiar primary sources such as patents and copyrights, books about specific companies, and period advertisements also provide a wealth of information to assist with dating.
Ann Pitman’s was then reviewed, as it includes photos and years of production for many De Lizza and Elster designs.
Researching Costume Jewelry at Way Jewels at Glory Antiques at Mary Ann Docktor-Smith is a vintage jewelry collector, historian and dealer.