I had experimented earlier with creating 3D printed cameo frames, suitable for use in cameo pendants and medallions. I have now extended that design to glowing rings in various sizes. They each use a single CR1220 battery to light their LED core, which can sustain the same brightness for 8 hours or more, depending on temperature conditions.
These rings can be a viable alternative for those with allergic reactions to certain metals. The only metals exposed to the skin are the battery and a small copper wire soldered with non-leaded solder.
EDIT: Ring styles now also come in Mystic Rune and Starburst designs.
All of these rings can be made in sizes from 7 to 11 US.
Each one is priced at $10 USD, plus additional tax and shipping.
Be certain to specify the style, color of crystal, color of ring finish, and finger size when ordering.