The Corum Classical Billionaire Tourbillon is an ultra-limited edition wristwatch with 850 diamonds. The watch has a manually wound skeletonized Caliber CO-372 by Corum and La Joux-Perret. The case is 46 mm in diameter and comes in four gem-set versions ranging from $325,00 to $998,000. There are only 10 pieces of each of the four variations.