Watch cases make a great frame for a pendant. Here are 2 that I made. I matched the condition of the case to its content to make a shiny fancy pendant, or a more rustic nostalgic one.
You can also add decorations on the outside. At the "Cat Princess" pendant, some of the jewel stones are from the outside.
danit posted this project as a creation without steps
Here are some similar tutorials to help you make this one!