As the silversmith to the last king of France and the House of Orléans, Christofle knows that everyone is entitled to a little royal treatment now and then—and what better way to celebrate a crowing achievement than with a crown of one’s own? Created in partnership with the Los Angeles–based interior designer Martyn Lawrence Bullard, Christofle’s latest series, Silver Kingdom, is a handcrafted pair of crowns from its Haute Orfèvrerie atelier. Bullard—an avid collector of silver spoons since the age of 9—took i…