Greubel Forsey Balancier Convexe S² Black & White Ceramic

Greubel Forsey unveils the final two editions of the Balancier Convexe S² – one in black ceramic and 5N red gold, the other in white ceramic – marking the conclusion of a calibre developed and built over the past five years. Each edition is limited to only 11 timepieces, making them the most exclusive executions of the series. Housed in the signature Convexe case measuring 41.5mm across the caseband and built around the hand-wound 30° inclined balance wheel system, these editions represent the definitive expression of the Balancier Convexe S² movement. With their release, the calibre enters its final phase: production will cease permanently in 2026, closing this chapter of Greubel Forsey’s mechanical development.

From its origin, the Balancier Convexe S² was designed as a fully integrated object in which case geometry and movement structure evolve together. The Convexe architecture follows the natural curvature of the wrist, allowing the three-dimensional movement to remain balanced, legible and comfortable in daily wear. Rather than enclosing the calibre, the case extends its architecture outward, reinforcing the dialogue between exterior form and mechanical construction.

At the heart of the movement lies Greubel Forsey’s 30° inclined balance wheel system, positioned as the visual and chronometric centre of the composition. The movement is built around openness and perspective, with multi-level bridges and suspended structures designed to reveal rather than conceal mechanical function. Composed of 301 components, with an escapement platform of 68 parts, the calibre combines structural lightness with technical density. Two fast-rotating coaxial barrels provide a 72-hour chronometric power reserve, while the in-house variable-inertia balance with six gold mean-time screws operates at 21’600 vibrations per hour.

The finishing philosophy remains fundamental to the identity of the timepiece. Titanium bridges and main plates are frosted and hand-finished with polished bevels, countersinks and carefully executed transitions between surfaces. Every component is treated with the same level of attention, including areas that remain largely unseen, reflecting a consistent approach to execution where integrity of construction prevails over visibility. The two final editions express contrasting visual identities while sharing the same mechanical foundation.

The black ceramic and 5N red gold edition emphasises contrast and depth. Black-treated movement components and the ceramic case frame the architecture, while the red gold bezel and caseback introduce warmth and visual weight. The interplay between matte and polished surfaces amplifies the three-dimensional character of the movement and reinforces the sculptural nature of the Convexe case.

The white ceramic edition explores the opposite approach. The monochromatic light-toned case accentuates openness and precision, allowing the movement to emerge through light and shadow. The result is a more technical and graphic expression, where structure becomes the primary visual language. The white ceramic construction highlights the purity of the Convexe geometry while preserving the same mechanical depth and legibility.

Both editions retain the essential functional layout of the Balancier Convexe S²: hours and minutes displayed on a suspended arch bridge, small seconds, and a sector power-reserve indication. The curved sapphire crystals, threedimensional bezel geometry and profiled lugs reinforce the continuity between movement architecture and exterior form, maintaining the balance between presence and wearability that defines the Convexe approach.

These two editions complete a five-year exploration of the Balancier Convexe S² calibre through different material and aesthetic interpretations. Their release marks not an evolution, but a conclusion. In 2026, production of the movement will end permanently.

The year 2026 also marks the beginning of a gradual transition toward an almost entirely new collection. As Greubel Forsey closes the chapter on calibres that have shaped the past years of technical and creative development, each will be retired deliberately – not silently – with a final expression that celebrates its contribution to the Atelier’s continuous evolution.

Limited to only 11 timepieces per edition, the black ceramic / 5N red gold and white ceramic executions stand as the final and most exclusive expressions of the Balancier Convexe S² – the closing statement of a calibre defined by architecture, chronometric intent and mechanical coherence.

Greubel Forsey Balancier Convexe S² in black ceramic and 5N red gold

Technical specifications

Greubel Forsey Balancier Convexe S² in black ceramic and 5N red gold

Limited edition of 11 pieces

Case

Material: In ceramic and 18k 5N red gold with curved synthetic sapphire crystal
Diameter: 41.50mm
Bezel diameter: 44.00mm
Height: 13.25mm
Height on synthetic sapphire crystals: 14.80mm
Three-dimensional, variable geometry-shaped bezel, hand-polished with hand-finished straight graining
Ceramic profiled lugs, screwed fixing
Crown in 18k 5N red gold, titanium and rubber with GF logo
Transparent back with high domed synthetic sapphire crystal
Titanium security screws, black treatment
Raised engraving “Balancier Incliné” and “Greubel Forsey”
Water-resistant 3atm - 30m – 100ft (standard NIHS 92-20/SN ISO 22810:2010)

Dial and hands

Three-dimensional, variable geometry hour-ring, polished, with engraved and lacquered minutes indexes
Three-dimensional, variable geometry hour indexes, polished, with Super-Luminova
Power-reserve indicator, engraved and lacquered
Gold small seconds dial, polished bevel, black treatment
Hours and minutes, curved profile, polished steel with Super-Luminova
Small seconds, in polished steel, flat black polished head
Power-reserve, red triangle

Movement

Hand-wound movement • Patents pending
Diameter: 37.00mm
Thickness: 10.05mm
Number of parts: 301
Escapement platform: 68 parts
Number of jewels: 43
Olived-domed jewels in gold chatons
30° inclined Greubel Forsey balance wheel system
Balance wheel: In-house variable-inertia with 6 gold mean-time screws (12.60mm diameter)
Frequency: 3 Hz, 21'600 vph
Power reserve of 72 hours

Functions/Indications

Hours and minutes, on suspended arch bridge
Small seconds
Power reserve on a sector

Strap and buckle

Hand-sewn textured rubber or rubber with text in relief
18k 5N red gold and titanium folding clasp, engraved GF logo

MSRP: Price on request

Greubel Forsey Balancier Convexe S² in white ceramic

Technical specifications

Greubel Forsey Balancier Convexe S² in white ceramic