I've been going nuts making steampunk stuff this weekend.
I made the larger ring from the guts of an old clock, a green glass bead, and copper wire (for the band and the setting for the bead). Everything is soldered together, no gluing.
The smaller ring is made from a gear-shaped metal bead with a green plastic "stone" soldered to a copper wire band. The stone was made from plastic sheeting which I melted into a dome shape, filled the with glue, and colored silver on the back (so the finished stone would be shiny). My steampunk goggles: [link] My steampunk flash drive: [link]