Leonardo da Vinci spent nearly 16 years perfecting the magic behind Mona Lisa’s smile. She seems to smile back mysteriously; reacting to the onlooker’s gaze. The illusion behind the enigmatic quality is thought to be the fact that she appears to be smiling, but if you look directly at her mouth, it seems to be downturned. We have no illusions here, and guarantee onlookers will be smiling when they notice you in this pair of earrings – they're a real crowd stopper.