The Royal Oak Concept line is something of a skunk-works line within Audemars Piguet, pushing design and materials further than you'll see in traditional products. Launched in 2008, the Concept has taken on a life of its own within the collecting world, and this latest addition will certainly get a few hard-core AP guys' juices flowing. The Concept GMT Tourbillon for 2014 not only features a twin-barrel, manually wound, completely in-house movement with tourbillon and GMT, but for the first time, a white ceramic upper plate, in addition to bezel, crown, and pushers.

The white ceramic is almost totally scratchproof and requires special diamond-tipped machines to cut. In fact, it takes over 8 hours to create this ceramic bezel, while a normal steel bezel would take around 45 minutes. The 44mm case is made of titanium, which is then hardened by anodisation. The 10-day movement is just remarkable to look at, and this new AP Concept again displays their strength in materials engineering.

More on this one here.