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Henri Grandjean Atrivm White Sapphire with translucent case and rose gold dial
The MagicianAtrivm

White Sapphire

Architecture of Light.
Light, in its purest form.

CaseWhite sapphire
Dial5N 18K Rose Gold (Au750)
TourbillonMysterious three-axis
Diameter45 mm
White sapphire case detail

The Case

Sapphire

The case is crafted in sapphire, defining a transparent volume around the movement.

In its pure form, light remains unaltered, shaping the perception of space.

A structure defined by light, free of obstruction.

5N rose gold dial with blue indexes

The Dial

5N Rose Gold

Executed in 5N 18K rose gold, the dial reveals a uniform, softly reflective surface. A point of stillness, within a field of clarity.

Blue-coloured indexes introduce contrast, maintaining coherence within the transparent structure.

Rose gold hands and dial detail

The Hands

Rose Gold in Motion

Crafted in rose gold, the hands feature polished, domed and lightly hammered surfaces.

Their warm tone brings clarity, maintaining coherence within the transparent architecture.

In-house calibre with 5N finishing

The Movement

A Unified Architecture, in 5N

A hand-wound calibre conceived as a structure, where each component finds its place within a coherent whole.

Built around the mysterious three-axis tourbillon, it organises motion, space and balance into a continuous architecture.

Finished in a 5N tone, it extends the language of the case into the movement. Case and mechanism, conceived as one.

Triple-axis tourbillon with blue cages

The Tourbillon

The Mysterious Three-Axis Tourbillon, in Blue

Suspended in space, it appears to float — untethered, yet perfectly composed.

No visible bridge. No apparent support. Only motion. Three axes in constant rotation, unfolding a structure that never settles.

In blue, the cages take on a shifting presence, intensifying depth and motion. A spectacle for the eye. A resonance for the ear.

Gallery

Details & Craftsmanship

Technical Details

Specifications

  • MaterialWhite sapphire
  • Diameter45.00 mm
  • Thickness16.00 mm
  • Lug-to-Lug45.80 mm
  • Lug Width22.00 mm
  • CrystalSapphire crystal with anti-reflective treatment
  • Water Resistance30 metres
  • TypeMechanical, hand-wound
  • CalibreIn-house calibre
  • Regulating OrganMysterious Triple-Axis Tourbillon at 9 o'clock
  • Frequency21,600 vph (3 Hz)
  • Lift Angle52°
  • BalanceVariable inertia
  • Balance SpringFlat
  • BarrelsTwin
  • Jewels29
  • Visible Gear TrainYes
  • Winding StemManual, 2 positions (time / date)
  • Diameter38.50 mm (17''')
  • Total Height12.1 mm
  • Tourbillon Cage Diameter38.00 mm
  • Stem Height3.30 mm
  • Stem Thread DiameterS0.90
  • Movement Components218
  • External Components21

Cage Rotation Speeds

  • First Cage1 revolution / 10 seconds
  • Second Cage1 revolution / 18 seconds
  • Third Cage1 revolution / 60 seconds
  • Dial Material5N 18K rose gold
  • FinishingCircular, with stretched perimeter
  • Sapphire DiscAnti-reflective, frosted band
  • TransfersDual black and red
  • HandsRose gold, polished, domed, hammered finish
  • Time IndicationHours and minutes
  • Central dateStar-shaped indicator
  • Day / Night Indication
  • 24-hour wheelSeparated day and night displays
  • Bridges and MainplateCôtes de Genève
  • Bevels and ChamfersHand-polished
  • WheelsCircular-finished and chamfered

By Appointment Only

Private Presentation

Visit our Geneva showroom for a confidential introduction to the collection, offered by appointment.