Vintage costume jewelry is a far cry from the fashion pieces you will find in most department stores. In fact, while new costume jewelry will literally depreciate in value, signed vintage jewelry from the 1920's through the late 1960's and early 70's is still appreciating in value. Thousands of jewelry enthusiasts are finding vintage jewelry collecting profitable-when they know what to look for when buying. Identifying the valuable vintage costume necklaces, rings, and other pieces to collect boils down to knowing ...