How do I clean ivory jewelry which has turned dark?

I wonder if a pencil eraser would help. Try a little (gently) on a surface you normally don't see (e. g. the back) and see how it goes.

Here are some hints that suggest how to care for ivory jewelry. Follow this link:

http://www.ehow.com/how_4853179_clean-ivory-jewelry.html

Ivory jewelry has a great demand because of its beauty. You should take a great care to clean and preserve the ivory jewelry because if you damage it the damage will be beyond repair.