These are a pair of assymetrical oystershell earrings with catgold in them. I have collected the shells and the catgold on my mermaid journeys to the archipelago of Gothenburg. 
The hooks are made out of 1,0mm copper wire, copper does not withold nickel wich makes it suitable for the wearer that has skin allergies.
More about copper: Copper withold animicrobial properties by effectively killing bacteria, viruses, and fungi by disrupting cell membranes, damaging DNA/RNA, and creating oxidative stress through released ions, often eliminating over 99% of microbes within hours on its surface.