for assignment #1, we were asked to design a series of 5 signet rings and provide historical source material
http://university.langantiques.com/index.php/Signet_Ring
http://metmuseum.org/art/collection/search/558781
http://www.history1700s.com/index.php/articles/14-guest-authors/703-modern-history-of-signet-ring-how-it-got-its-existence.html
http://www.metmuseum.org/exhibitions/listings/2015/treasures-and-talismans
http://hyperallergic.com/223453/the-meaning-of-the-ring-from-memento-mori-to-marriage/
an additional article on the exhibition treasures and talismans at the cloisters from the collection i was looking at:
http://www.nytimes.com/2015/09/04/arts/design/treasures-and-talismans-at-the-cloisters-puts-rings-on-a-pedestal.html?_r=0