These are earrings from a time when the engraving wasn't on the earring itself, but on the earring post, and the catch was stamped with "k18." o(^▽^)o Earrings from this era, made of k18 (18-karat gold), are characterized by a thin back on the front and a post attached. o(^▽^)o Only one pair, the one with the purple gemstone (looks like amethyst) in a heart, has a white gold or platinum base below the heart. ( ´ ▽ ` ) There are only three single earrings, and no catches, so please judge and confirm from the images. ( ´ ▽ ` ) I don't mind if you're buying for profit, but please don't buy if you're not trustworthy and will complain later. It's a nuisance... Therefore, I'm selling three single earrings as regular design earrings.