These are loose time periods for the various eras that define the style and grace of jewelry.
Georgian era - c1800-1835
Victorian - c1835-1901
Art Nouveau & Art Deco - c1890-1935
Edwardian - c1890-1910
Retro - c1940
Antique - 100 years or older (currently c1909 or before)
Vintage - 20 years or older (currently c1989 or before)
A variety of information on vintage jewelry and vintage collectibles in general.