Purchased at a Tsutsumi store several years ago. Used a few times and then stored in a dark place. Stamped K10. No pets or smokers. Please refrain from purchasing if you are sensitive to used items. ※ The following is a product description. These are blue moonstone earrings with a mysterious shine. Blue moonstone refers to moonstones that have a particularly beautiful bluish-white glow. This glow is caused by a phenomenon called "schiller," which is produced by the internal structure of the stone. Material: 10K gold Yellow gold Blue moonstone Size: Length 5.2mm Width 4mm