This 18k rose gold and diamond Yvonne Léon heart earring is crafted in France and is sold on its own. According to people with too much time on their hands, it would cost an estimated $300 million to kit yourself out as a real-life Batman. So if someone you know is considering such an extravagance, why not suggest they buy you this Yvonne Léon earring instead and save the mid-life crisis for an ill-advised motorbike?