925 sterling silver (+1 micron 18k gold plated). This earring is sold individually.
Avoid water, chemicals and sweat by removing your jewelry before cleaning, excercising or showering. The oils on your skin, however help keep sterling silver from oxidizing faster, so wear your pieces often!
It is important to store your jewelry in a safe and dry place, away from direct (sun) light. Clean your jewelry with warm water rather than hot water, with dedicated silver cleaning products and a jewelry polishing cloth to avoid scratches.