I handcraft these circles from fine silver wire by fusing, hammering and tumbling. A little herkimer quartz "diamond" is handwired to the circle. 
 
1/2" long.
 
Fine silver is 99.9% silver. Herkimer diamonds only come from one place in the world! The mines in Herkimer, NY. They actually grow the way you see them. 
 
Sterling silver leverback earwires.
 
All silver will tarnish over time. Keep away from moisture and any chemicals (think hairspray or perfume). I like to keep mine in a plastic bag when I'm not wearing them.