I do allow the amber necklaces and small stud earrings - pierced ears is a pet peeve but once done, not much I can do about situation. The amber necklace I worried about first time but they tend to be quite snug and haven't caused issue. I do tell parent that if it gets grabbed by another child and broken that is risk they take in wearing here and I not taking responsibility for it. It been a non-issue to date.