Your fingertips are a touch sensitive. They do most (if not all) of the work of being a finger, yet it's the rest of the digit that gets to dress up and look nice. UK-based Thai jeweller Natha Khunprasert makes sure your tips get the focus they deserve.
If you're one for breakthroughs of the scientific sort, there's this ring by Lucie Houdková, which could make you feel like you're splitting the atom (or maybe just a molecule). The Czech jeweller has a large portfolio of eclectic work!