Welcome to Jewelco London and thank you for visiting! Jewelco London Solid 9ct Yellow Gold Hinged Sleeper 1mm Hoop Earrings 12mm. Features hinge and notched post to create an illusion of a seamless design Every jewellery collection should include at least one pair of hoops. These hinged sleeper hoops are crafted from 9ct gold. They are robust, but small, unobtrusive and delicate to look at.