Already available in several stunning versions, Tonda Métropolitaine Collection from Parmigiani Fleurier now welcomes a new reference featuring aventurine dial that takes inspiration from star-studded midnight sky.
Small inclusions of metal give aventurine its characteristic textured appearance. Taking advantage of the natural composition of this material, Parmigiani is presenting a midnight-blue aventurine dial whose surface – mottled with fine golden fragments – looks astonishingly like stars sparkling in the night sky. The hands are skeletonised so as not to obscure the beauty of the dial and the appliques are made from white gold – gold being the distinctive feature of the indices on aventurine dials.
This is the case, for example, for the variable-inertia balance, which now eliminates the need for the standard index-assembly. This innovation makes it possible to adjust the moment of inertia by rotating the inertia blocks rather than adjusting the active length of the balance-spring as required with a standard adjustment. It also functions stably over the long term, makes the watch shock-resistant and, as the counting-point is maintained, guarantees outstanding isochronism. This consistency is reinforced by the double barrel which enables a more stable, linear distribution of power than a single barrel in the calibre.
At the end of the production process, the master craftsmen finish each component by hand, giving a result which cannot be reproduced by machine. The bridges are bevelled on a bench grinder, all the visible parts of the movement are circular-grained and the Côtes de Genève decorations add the finishing touch to the piece. The manual work invested in each calibre is immense, leading to technical marvels born from a perfect marriage of industry, watchmaking expertise and craftsmanship.
Power reserve: 50 hours
Frequency: 4 Hz – 28,800 Vib/h
Dimensions: 10 ½''' – Ø 23.9 mm
Thickness: 3.9 mm
Shape: Round, in 3 sections
Dimensions: Ø 33.1 mm
Thickness: 8.65 mm
Material: Stainless steel
Number of diamonds: 72
Water resistance: 30 m
Crystal: Anti-reflective sapphire
Material: Blue aventurine
Indices: 18 ct white gold appliques
Hands: Skeleton Delta-shaped
Material: Alligator or fabric
Colour: Blue or Indigo blue