Manufacturing stone for watchmaking and other industries


Two stories, one merger

The Pierhor SA company was founded in 1899, which makes them the oldest manufacturer of jewels for watch making still active today. Specialising in the production of rubies for watch making, they have supplied the major brands of the Swiss watch making industry from their very beginning.

The Gasser-Ravussin SA company was founded in 1927. Also specialising in the production of watch making stones, they were pioneers in the laser manufacturing of rubies and sapphires and rapidly developed non watch making alternatives for international markets.

The year 2017 marked the beginning of a new adventure for both of these companies when they were acquired by the Acrotec group. In 2018 both companies merged on the original site of Pierhor SA in Ecublens to become Pierhor-Gasser SA. This new independent entity combines over 200 years of watch making know-how in addition to opening up to non watch making international industries.

Unique know-how

The principal materials manufactured are synthetic single crystals such as rubies, sapphires and spinels as well as technical ceramics. The materials have the distinction of having a hardness ranging from 1’200 to 2’000 Vickers.

The developed manufacturing procedures enable the precision of microns, not only for the machining of holes of 0.05mm in diameter, but also for external cylindrical grinding of 5mm parts.

These procedures provide surface qualities in nanometer which enable the systems that integrate them to reach the required performance.


Pierhor-Gasser supplies the following industries :

  • Watch making : manufacturing of watch making stones ; ultra precise single crystal horology rubies; ultra hard material machining ; synthetic sapphire parts ; hard metal parts for luxury mechanical watch movements
  • The machine tools : bearings for machine tools ; parts for the calibration of fluids and gases; cutting heads ; water jet nozzles
  • Electronic connectivity and electronic fields : precision bearings
  • The medical sector : production of parts from biocompatible materials
  • The aeronautical sector



  • Horology
  • Machine tools
  • Connectors
  • Medical
  • Aeronautical


  • Manufacturing of precious stones for watch making and industry
  • Manufacturing of machines
  • Hard metal parts for luxury mechanical watch movements
  • Ultra precise single crystal rubies for watch making
  • Machining of extra hard materials
  • Synthetic sapphire parts
  • All parts for the calibration of fluids and gases
  • Nozzles for cutting by water jets and various injections
  • Precision bearings made of ultra hard materials
  • Laser machining of corundum and ceramics
  • Drilling and cutting of crystalline micro parts by laser machining



Chief Executive

Chemin du Croset 9B, CP 107, 1024 Ecublens, Suisse
+41 21 661 28 70