That’s what I told my daughter (age 13) today, when she received a beautiful heart-shaped locket (with picture of her dog inside). I noticed that the locket made grayish marks against the inside of its cardboard box. I spent an hour online, looking up product recall lists, and information on lead in jewelry.
The Consumer Product Safety Commission and the Sierra Club are taking steps toward banning lead in kids' jewelry. In the meantime, avoid buying silver-colored jewelry that's not real silver.