These are my pathetic attempts (not including the multiple mistakes that I erased) before I finally got it right:
And finally, a mixed success. I need to practice drawing jewelry from life, I think. It's pretty hard to visualize without a real life reference. Lots of geomtry going on and not at all free form like my everyday sketching. Normally I just sketch to keep ideas in mind just for myself, trying to express an idea to someone else, someone who doesn't really understand jewelry, is much, much harder.