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Henri Grandjean Atrivm Green Sapphire with green sapphire case and green Grand Feu enamel dial
The MagicianAtrivm

Green Sapphire

Architecture of Light.
Light, revealed in green.

CaseGreen sapphire
DialGreen Grand Feu enamel
TourbillonMysterious three-axis, matte grey cages
Diameter45 mm
Reference50-01-HSG/GN

Where Heritage Meets the Future

A world premiere in Haute Horlogerie.

For the first time, Grand Feu enamel, contemporary sapphire architecture and a Swiss hand-finished manufacture movement come together within a single creation.

A centuries-old métier d’art enters a resolutely contemporary architecture — not to preserve the past, but to carry its savoir-faire forward.

Centuries of craftsmanship. Contemporary sapphire architecture. One enduring vision.

Green sapphire case, front view

The Case

Green Sapphire

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

In green, light takes on depth, revealing shifting nuances within the space.

A structure defined by light, free of obstruction.

Green Grand Feu enamel dial detail

The Dial

Green Grand Feu Enamel

Executed in Grand Feu enamel, the dial reveals a surface of remarkable depth and luminosity.

Its green tone responds to the sapphire architecture, creating a continuous dialogue between colour, light and material.

Matte grey triple-axis tourbillon, three-quarter view

The Tourbillon

The Mysterious Three-Axis Tourbillon, in Matte Grey

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 matte grey, the cages introduce a restrained contrast, allowing their motion to emerge against the depth of green.

Gallery

Details & Craftsmanship

Technical Details

Specifications

  • MaterialGreen 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 MaterialGreen Grand Feu enamel
  • 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 and tourbillon-side mainplate in green Grand Feu enamel
  • 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.