If you want to purchase an authentic ring from a design period, deal only with a reputable antique jewelry store.
Be wary of rings marked as reproductions, modern rings made to resemble antiques.
From contemporary pieces to antiques, jewelry hallmarks are typically found on gold and silver jewelry.
These hallmarks — commonly known as purity marks, maker’s marks, symbols, or date letters — can give you some useful insight on the materials, epoch, and producer of a piece of jewelry.
The difference between a collector and the Jewelry Investor... But when buying these jewels of yesterday, how can you invest money in jewelry antique and be certain that what you are buying is authentic and not relatively new and worth its claimed value? From my experience, one of the best date and value tips, is to buy from reputable dealers who guarantee their items.