These earrings are quality made. The backings are very secure and the jewlers mark is actually euro marked at 18k white gold.. no PL for plating..so you might be getting a better product than you thought. The earrings can be stone heavy  at 1 ct stud and above. So the backings are definitely created to secure those heavy stones. They clean up brilliantly with a gentle scrup in some warm soapy water. I reccomend these as a great diamond alternative. I have a parrot who has tried to destroy them while on my shoulder... and yank them out of my ears.. but the backing held firm and the prongs kept the stone solidly mounted!!