Zenith Defy El Primero 21 Spectrum – Blue 32.9006.9004/06.R918

The rest of the case is set with 288 brilliant-cut white diamonds, and the watch comes on a rubber strap. The Orange (32.9005.9004/05.R944), Purple (32.9007.9004/07.R922), Green (32.9008.9004/08.R943) and Black (32.9009.9004/09.R921) editions share the case and skeleton dial and change the stones: orange sapphires, amethysts, tsavorites and black spinels.

Inside is the automatic El Primero 9004, a dual-escapement movement whose chronograph runs at 360,000 vibrations per hour, so it reads to 1/100th of a second. The Defy El Primero 21 Titanium Diamond (32.9000.9004/78.R582) also has a gem-set bezel, but in a titanium case and without a limited run.