Grace Kelly and Audrey Hepburn are commonly sighted as sources of inspiration for designers. Few reference Joan Crawford. I am not talking about the latter hard-edged part of the actress's career, but the early days. If you don’t know what I am talking about fire-up your Netflix cue and watch her smolder in 1931's Possessed. In the art deco film you will see sultry, sexy Crawford and all the glamour Pagani poured into this ring.

$6,225; barneys.com.

—Marion Fasel, Contributing Editor, Fine Jewelry and Watches