Classic Crescent Moon stud earring with a threadless flat back push pin style backing. Available in 14k yellow gold. Moon measures 4mm.åÊ Threadless Flat back pin measures 6mm length, 20 gauge thickness. Perfect for wearing 24/7 and never taking off. The flat pin back makes earrings comfortable enough to wear during sleep and all of life's adventures. Made with solid 14k yellow gold safe for wearing in showers, swimming, and everything else. Naturally nickel free and hypoallergenic. Made in USA. Earring sold as singles; choose quantity of 2 if you want a pair.