I have a pair of 9ct yellow gold earrings from a well known jewellery store. One of them is damaged, so I took them with me this morning & enquired at the gold buying kiosk. Am disappointed to learn that the backs are attracted to the magnet [got other metal mixed in it] & hence she could not offer to buy them for the gold content. Plus they're not stamped 9ct [which didn't bother me as I just thought they were not the right design / shape] So a lesson learnt, I shall be more discerning & ask questions [rather than just assume] next time I'm interested in buying earrings.