Leverback Halo Sapphire earring in 18K White Gold. These Sapphire Leverbacks will sparkle and shine all day and night, add glam to any outfit. Stone: Sapphire. Stone treatment: lab-created. Finish: 18K White Gold. Lead- and nickel-free. Hypoallergenic. Base Metal: Brass. Closure: Leverback. Size: 26mm L x 12mm.