I casted a inch-length semi cylindrical pendant out of old school solder and wore it around my neck on the bare skin for few days. I eventually stopped because I wasn't feeling to great after sleeping with it for some nights. I'm curious how it affected me. I noticed that my character changed to more anxious around that time and it stayed like that ... but it might have just been an effect of going through puberty.

Metallic lead in jewelry worn on skin shouldn't be a particularly major risk for lead poisoning, especially when worn only a few days.