Jewelry (unless it is plastic, textile or on elastic) has metal in it. We are all familiar with platinum, silver, gold and sterling silver - but what about those others ones - those not-so-precious metals we wear everyday?
If you care about what goes IN your body you should care about what goes ON your body. Mysteries make great novels - but no one wants the metal on your skin all day to be a mystery.
When I was a new designer I just about went crazy. What was this stuff from China labeled "metal"? In my personal life I investigated safe household cleansers, make-up, even my conditioner is gluten free! I should certainly be able to find safe jewelry findings.
I now design with natural brass. I know exactly what the metal is (85% copper and 15% zinc) and it's made in the USA! I buy directly from the manufacturer - the brass is lead-free, nickel-free and aged by an eco-friendly process.
It's so nice to design with peace of mind!