They have an extensive library of jewelry marks located here: Researching Costume Jewelry.Just scroll down a little and click the letter of the alphabet for the company marks you wish to view.The photo below shows the various signatures you’ll find on Trifari vintage jewelry.Trifari Vintage Jewelry Marks Resource: I’ve published a brief guide with photos that discusses various signagures for Trifari vintage jewelry.As a general rule, signatures without a copyright symbol indicate the piece was manufactured prior to 1955. Jewelry companies would often use up their supply of pre-stamped clasps and findings after switching to a new signature, so some pieces made soon after 1955 might not have copyright symbols.A detailed study of vintage jewelry marks could fill multiple books, but to give some guidance we can use the Trifari company as an example.
Prior to the change in the copyright law in 1955, the designs were patented.
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Vintage costume jewelry usually doesn’t have purity marks, but will often have a maker’s mark (commonly called the signature), and can sometimes have a retailer mark and/or patent or inventory marks.
Patent numbers are especially helpful when dating older vintage jewelry, and will be covered in a separate article in this series.
Maybe you’ve just acquired some vintage jewelry from a family member or friend.