What is Art Nouveau

Art Nouveau is a late 19th and early 20th Century style of art that
found its way into jewelry. It is generally depicted as curved, flowing, assymetrical forms, recurring and intertwining as leaves, flowers and insects.

There were several renowned designers that were famous for art nouveau jewelry designs.

Rene Lalique                     
Henri vever
Goerges Fouquet
Louis Comfort Tiffany
Lucien Gaillard

Medusa pendant by  René Lalique, via Gazette Drouot