The best hoop earrings are among the most essential pieces of jewelry in one’s collection. They’re a must-have, a go-to, a classic staple—not to mention, an instant confidence boost.

Department of Medicine, Khalil Karimi and Petra C. Arck are in the Brain Body Institute, McMaster University and St Joseph's Healthcare, 50 Charlton Street, Hamilton, L8N 4A6 Ontario, Canada ...