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Henri Grandjean Atrivm Blue Sapphire with sapphire case and aventurine dial
The MagicianAtrivm

Blue Sapphire

Architecture of Light.
A volume shaped by transparency.

CaseBlue sapphire
DialAventurine
TourbillonMysterious three-axis, blue cages
Diameter45 mm
Blue sapphire case detail

The Case

Sapphire

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

In blue, light takes on depth, shaping the perception of space.

A structure defined by light, free of obstruction.

Aventurine dial with rhodium indexes

The Dial

Aventurine

Executed in aventurine, the dial reveals a deep, celestial surface, alive with light.

A point of stillness, within an open, luminous architecture.

Rhodium indexes introduce clarity and contrast, maintaining coherence within the structure.

Rhodium hands detail

The Hands

Rhodium in Motion

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

Their cool tone brings clarity, maintaining coherence within the transparent structure.

In-house calibre with rhodium finishing

The Movement

A Unified Architecture, in Rhodium

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 rhodium tone, it extends the language of the case into the movement. Case and mechanism, conceived as one.

Blue triple-axis tourbillon 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

  • MaterialBlue 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 MaterialAventurine
  • FinishingNatural crystalline surface
  • Sapphire DiscAnti-reflective, frosted band
  • TransfersDual black and red
  • HandsRhodium, 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.