Introducing the Bianchet UltraFino Sapphire, the world’s thinnest full-sapphire tourbillon at just 9.8 mm. This timepeice reimagines Bianchet’s ultra-thin skeleton tourbillon in a fully transparent sapphire case, uniting architectural purity with modern resilience. Its curved tonneau form, inspired by the Golden Ratio and Fibonacci geometry, allows light to flow freely through the movement’s skeleton, showcasing the Maison’s philosophy of combining elegance, ergonomics, and strength. Unlike most sapphire watches admired more than worn, the UltraFino Sapphire is built for everyday life. Scratch resistance, hardness, and a celebrated white rubber joint ensure 5 ATM water resistance, transforming a functional detail into a distinctive design signature.
At under 10 mm, the UltraFino Sapphire stands among the slimmest full-sapphire watches ever created. Most comparable pieces range between 11.5 and 23 mm, but Bianchet’s machining precision delivers an exceptionally thin case without sacrificing durability. Achieving this curvature in sapphire is one of horology’s greatest challenges, requiring micron-level accuracy and a movement slim enough to fit the exacting dimensions. Inside beats the UT01 calibre, an ultra-thin automatic tourbillon just 3.85 mm thick yet resistant to shocks of 5000 Gs. Its titanium bridges, hand-finished for over fifteen hours, frame a gold oscillating weight shaped into Fibonacci spirals, a poetic signature at the heart of Bianchet’s design language.
Completing the watch is a natural vulcanized rubber strap, offered in white and black, secured by a grade 5 titanium buckle. Soft yet resilient, it echoes the case’s flowing geometry while offering comfort for daily wear. The UltraFino Sapphire proves that a sapphire watch can transcend showcase status: it is both a technical feat and a refined companion, uniting transparency, lightness, and endurance in one of the most daring interpretations of contemporary watchmaking.
