Jacob & Co. sets the first diamond-set balance wheel in modern watchmaking, at $693,000

Jacob & Co. has unveiled a tourbillon with what it calls the first diamond-set balance wheel in modern horology, the Brilliant Flying Tourbillon Baguette Pastel Arlequino. The balance wheel carries 54 brilliant-cut white diamonds. The New York brand will make just one example, and it is priced at $693,000.

Setting stones on the regulating organ itself, rather than on bridges, plates or rotors, is the detail that makes this a genuine first. Swiss and French watchmakers tried it in the 1820s and 1830s, but the added weight from gems threw off timekeeping, and the practice was abandoned for two centuries.

How Jacob & Co. solved the weight problem

Jacob & Co. says the 54 diamonds add sparkle without compromising the watch's chronometric performance, the exact failure that ended the 19th-century attempts. The balance wheel oscillates at 3 Hz while the flying tourbillon completes one full revolution every 60 seconds at 6 o'clock.

That combination of motion and stone setting is designed to read as a continuous glow rather than a static sparkle. Jacob & Co. describes the diamonds catching the light so a halo appears to hover around the balance wheel, shifting with every passing second as the mechanism runs.

The sapphire caseback gives an unobstructed view of the bridges, which carry a further 234 brilliant-cut white diamonds. Between the balance wheel and the bridges, the movement side of the watch alone accounts for 288 stones, before the case is counted at all.

That movement is Jacob & Co.'s new in-house Caliber JCFA02, a self-winding construction with 184 functions and a 72-hour power reserve. It is the engine built specifically to carry the diamond-set balance wheel, and the brand has not said whether the caliber will appear in other pieces.

What covers the case, dial and buckle

The 42mm case is white gold, and Jacob & Co. has invisibly set the case, dial, crown and buckle with 366 colored sapphires and 56 white diamonds. Combined with the movement's stones, the finished watch carries 654 gems across its visible and hidden surfaces.

The color arrangement is called Arlequino, a nod to Arlecchino, the Harlequin character from Italian commedia dell'arte. Blue plays against splashes of lavender in a sequence meant to echo the colored diamond pattern on Harlequin's costume, one of the character's signature visual traits.

Each sapphire and diamond was matched to the same delicate lightness despite their differing hues, Jacob & Co. says, so the case reads as a coordinated composition rather than a scatter of mismatched color. That tonal matching is the harder craft claim behind the case's kaleidoscopic look.

Jacob & Co. built its New York identity on exactly this kind of maximalist engineering, treating a watch's complication and its gem-setting as equally important rather than one dressing up the other. The house is known across our coverage of style for pairing unusual mechanisms with heavy, deliberate stone work.

We have tracked that same instinct toward engineering led spectacle elsewhere in the watch category, including how Zenith's new Chronomaster Solo Sport is priced against Breitling's Chronomat B31 40, a comparison built on the same question of what a price actually buys a collector.

The piece unique format is central to the offer here. By committing to a single example, Jacob & Co. turns the $693,000 price into a claim on exclusivity as much as on craft, since no second buyer will ever be able to acquire the same watch.

That single-example approach echoes other recent one-off luxury commitments we have covered, from Aston Martin building just 300 units of its first road-legal motorcycle with Brough Superior to Fendi Casa's first Paris flagship: each stakes its value on a fixed, stated number rather than an open run.

Jacob & Co. has not indicated whether the diamond-set balance wheel construction will reappear in a future model or remain confined to this single watch. No production date, waitlist or additional pricing tier has been announced beyond the one piece already made.

For now the Brilliant Flying Tourbillon Baguette Pastel Arlequino stands as a single verified data point: a technical approach abandoned two centuries ago, revived with 654 stones, priced at $693,000, and built by Jacob & Co. to be sold exactly once.