In 2005 Rolex introduced the most known anti magnetic spring to date, the Parachrom spring. It is a combination of niobium, zirconium and oxygen alloy and once the alloy hits oxygen it turns blue in color. The name is comes from paramagnetic and the Greek CHROM meaning coloured.
The Parachrom was first used in the GMT II and the Daytona, in 2005. Most springs have an iron, nickel, and chromium base for their alloys.
The Parachrom hairsping can be found in the following Rolex timepieces:
- All Daytona’s since 2005 (4130 caliber are not blue hence are not parachrom hairsprings, contrary to popular belief)
- New versions of the GMT Master II (released in Gold 2005, Rolesor 2006, Steel 2007)
- Milgauss (2007)
- Deep Sea Sea Dweller (2008)
- Day Date II (2008)
- Gold Submariner with ceramic bezel (2008)
- Explorer II with 3186 movement (2008)
You can check out the Parachrom hairsping video below. The blue color at the very least restores a high level of horological craftsmanship of the past, giving it a very prestigious aesthetic.