Men's/women's 24k gold necklace 11mm wide...22 inches long..

I am allergic to 24k gold..like new necklace..barely worn. the serpentine chain is made up of 20 micro inches of pure 24k solid gold surrounding a core of semi precious bronze. the 24k gold is thicker than gold over sterling and is guaranteed not to tarnish..the tag most likely says lifetime for the no tarnish guarantee..I can't take a better pic of it..as it is ..I can't say for sure it says lifetime on it..