The fact that the new DeWitt Twenty-8-Eight Skeleton Tourbillon Set with Diamonds would be worthy of any royal’s wrist is no surprise considering that the Geneva-based horologist Jérôme DeWitt is the great grandson of King Léopold II of Belgium and a descendent of Napoléon Bonaparte. Named for the date on the French Republican Calendar when Bonaparte was announced Emperor of France, the regal timepiece carries a consort of 215 round diamonds draped over its skeletonized, sand-brushed-nickel silver ma…