Shell Game The Oyster Perpetual Sea-Dweller Deepsea ($9,250) from Rolex has a 43 mm stainless steel case that is pressure-proof to 12,800 feet, a helium escape valve, and a special timelapse bezel. With 31-jewel chronometer movement and a flip-lock-clasp oyster bracelet, you'll always know the time, whether you're taking a dive or simply going to the yacht club. Rolex, (212) 758-7700; www.rolex.com