The Moonphase model which is water resistant to 50 meters is developed in 18kt rose gold case and has a sapphire crystal. Manufactured in multi-layer dial, it has 46 jewels and a power reserve of 44 hours. Meticulously hand-crafted with Perlage and Traits Tirés treatment, it features a 150° retrograde day and date function with and exclusive moonphase indication. The Diver model is built in stainless steel case and is also AR-coated sapphire crystal. However it is water resistant to 300 meters. Certified with a Chronometer by the COSC, Diver has 21 jewels and a power reserve of 42 hours.Both the models are produced in a limited edition of 350 pieces only and known as the Bvlgari Diagono Collection.