Forty baguettes, one minute-long turn of a tourbillon, and a case under nine millimetres thick. The Bianchet Rotondo UltraFino Diamond, making its U.S. debut this weekend at WatchTime New York, sets a white gold bezel with natural diamonds around the young Swiss house’s ultra-thin round tourbillon, at CHF 92,500 before taxes.
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At a glance
- Watch: Bianchet Rotondo UltraFino Diamond, an automatic flying tourbillon.
- Price: CHF 92,500 before taxes, about $99,382 according to WatchTime; confirm with Bianchet.
- Diamonds: 40 natural baguette-cut diamonds, 1.6 carats in total, F–G colour and VVS clarity, set in an 18k white gold bezel.
- Case: 39.5mm Grade 5 titanium, 8.9mm thick, water resistant to 100 metres.
- Movement: in-house calibre UR01, 3.85mm thick, 225 components, 60-hour power reserve, solid 18k rose gold rotor.
- Edition: no production count or delivery date has been published.
What is the Bianchet Rotondo UltraFino Diamond?
It is the gem-set version of the Rotondo UltraFino, the round watch Bianchet introduced this spring as the first round case in its history. WatchTime describes it as “a new iteration of its ultra-thin flying tourbillon watch.” The 39.5mm case is Grade 5 titanium, but the bezel is 18k white gold, set with 40 natural baguette diamonds weighing 1.6 carats in total, graded F–G for colour and VVS for clarity. Through the skeletonised, openworked dial, the whole movement is on view from the front.
Despite the stones, this remains a sports watch in spirit. The case is water resistant to 10 ATM, or 100 metres, and Bianchet rates it to withstand shocks of up to 5,000 G. It comes either on an integrated Grade 5 titanium bracelet or on a white rubber strap with quick release, a pairing that, in our view, lets the diamonds read as light rather than formality.
How thin is the UltraFino flying tourbillon?
The case measures 8.9mm, and the calibre inside it, the UR01, just 3.85mm. A flying tourbillon has no upper bridge holding its cage, so the rotating carriage, here in titanium, seems to float on the dial side, completing one rotation every 60 seconds. Monochrome Watches explains how the brand saved height: the barrel sits at 12 o’clock under a curved bridge, the tourbillon at 6 o’clock as its counterweight, and the gear train is carried by segments of a single skeletonised bridge. The automatic winding comes from a full rotor on the caseback, here in solid 18k rose gold, and the movement runs at 21,600 vibrations per hour with a 60-hour reserve. It is developed and assembled in La Chaux-de-Fonds.
How much does the Bianchet Rotondo UltraFino Diamond cost?
CHF 92,500 before taxes, about $99,382 at WatchTime’s conversion. For context, Bianchet’s own listing for the Rotondo prices the titanium version at CHF 62,500, carbon at CHF 67,500, gold on rubber at CHF 85,500 and gold on an integrated gold bracelet at CHF 119,500, all before taxes. The Diamond therefore sits between the two gold versions, a premium of CHF 30,000 over plain titanium for the gold bezel and its 1.6 carats of baguettes. Confirm current pricing and availability with Bianchet or its retailers.
Who is Bianchet? A short history
Bianchet is among the youngest names in Swiss haute horlogerie. According to the brand, it was created in October 2017 by Rodolfo Festa Bianchet, an Italian entrepreneur who built a career in financial technology before turning a lifelong passion for watches into a company, and Emmanuelle Festa Bianchet, who comes from a family of French artists and began her career in journalism. The first prototype was shown at Baselworld in March 2019, and the first watch, the Tourbillon B 1.618, launched at Geneva Watch Days in August 2021, the same year a showroom opened in Neuchâtel.
The number in that first name is the golden ratio, a proportion the brand has used as a design rule from the start. The tonneau-shaped UltraFino followed in 2025 with the brand’s first automatic flying tourbillon calibre, and the Rotondo in 2026 rethought that architecture for a round case.
The diamonds themselves carry an older story. The baguette, whose name is French for a slender rod, the same word as the long loaf, is a step cut: instead of the brilliant’s scattered sparkle, its parallel facets give broad, mirror-like flashes. It became a signature stone of Art Deco jewellery in the 1920s and 1930s, prized for the clean lines it drew around a dial or a clasp. Set edge to edge around a bezel, baguettes also leave nowhere to hide, which is why colour and clarity matching matter so much on a piece like this.
Brilliants sparkle; baguettes reflect. Around a flying tourbillon, they frame the movement like a window rather than a halo.
The Carat Post
For the collector
- Price: CHF 92,500 before taxes, about $99,382 at the time of writing; U.S. retail will depend on taxes and exchange rates.
- Availability: Bianchet has not published an edition size or delivery date. Enquire with the brand or its retailers, and see the watch in person at WatchTime New York through Sunday, October 18; our show guide has the details.
- The stones: 40 natural baguettes, F–G and VVS. Check how evenly they are matched in colour and how cleanly they meet at the corners; if colour and clarity grades are new to you, our guide to the 4Cs explains them. Ask what documentation comes with the gem-setting.
- What drives value: an in-house tourbillon, thinness, finishing, and the quality of the stones and setting. Gem-set watches can trade quite differently from plain versions on the secondary market, and past prices do not predict future value.
- Wearability: 39.5mm and 8.9mm with 100 metres of water resistance make it, in our view, a diamond watch built for daily wear rather than evenings only.
Our view
In our view, the Rotondo UltraFino Diamond shows a young house learning the language of jewellery without losing its engineering voice. The baguettes are a natural fit for a design built on geometry, and the titanium case keeps the watch light and modern. Collectors drawn to sculptural tourbillons, from the Minerva Exo Tourbillon to the Girard-Perregaux Laureato Fifty Tourbillon, will find this one of the more distinctive gem-set alternatives of the season.
Frequently asked questions
How much is the Bianchet Rotondo UltraFino Diamond?
CHF 92,500 before taxes, about $99,382 at the time of writing. Confirm current pricing with Bianchet.
How many diamonds are on the Bianchet Rotondo UltraFino Diamond?
Forty natural baguette-cut diamonds, 1.6 carats in total, graded F–G colour and VVS clarity, set in an 18k white gold bezel.
How thin is the Bianchet Rotondo UltraFino?
The case is 8.9mm thick and the UR01 automatic flying tourbillon movement just 3.85mm.
Is the Rotondo UltraFino Diamond a limited edition?
Bianchet has not announced an edition size; ask the brand or a retailer about production and delivery.
Sources: WatchTime · Bianchet, Rotondo · Bianchet, founders and history · Monochrome Watches · Wikipedia, Bianchet
