The main material I use to make earrings is polymer clay. This is a PVC based, non-toxic plastic, which is flexible and soft when shaping and creating, then hardens when baked in the oven.
Gold & Silver Plated Findings
Plated metals are named after what they are - a base metal with a different plating. Usually this is brass, steel or iron, plated with a thin layer of gold or silver. These findings are fine for most people to wear frequently, but some with more sensitive ears might have some irritation. I always welcome enquiries for specific metal findings, and can source your preferred finish.
The findings I use are always nickel safe.
Some of my hoop findings are 304 stainless steel which, as above, most people are fine to wear. This metal doesn't tarnish.
Rubber Earring Backs
I use rubber earring backs for all stud or hook earrings. These are more comfortable to wear than metal, and often stay in place better. I recommend you use the backs even for hook earrings, to prevent them escaping! If you prefer metal butterfly backs, you can use any from your existing earrings - the posts I use are standard sized and they should fit perfectly.