Landscape view of Saxony, the home of A. Lange & Söhne

Sustainability matters

Lange watches are made from several hundred individual components, which are lovingly processed and then assembled by hand. When producing these individual components, we ensure that the raw materials used comply with international regulations. We believe our watches can last many years, as long as they are cared for. In a Lange watch, we only use components which we guarantee can be newly produced in the long term. 

View of the new, third manufactory building of A. Lange & Söhne in Glashütte, Saxony.

Careful use of resources

We have set ourselves the aim of continually reducing our energy consumption and optimising our energy footprint. This includes the careful use of natural resources such as paper, responsible waste management and the recycling of general and raw materials. We also favour working with regional service providers and pay attention to sensible, environmentally friendly logistics.
In 2015, A. Lange & Söhne opened a new manufacturing building. To make the manufactory as green as possible, a geothermal heat pump is used for heating, cooling and hot water. The use of the geothermal and green electricity to drive the heat pumps enables carbon-free energy supplies for the new building. The geothermal system that has been installed to this end is the largest in the Free State of Saxony to date.

Responsible Jewellery Council

The Responsible Jewellery Council (RJC) is an international non-profit organisation which brings together representatives of the watch and jewellery industry from all over the world who undertake to observe strict requirements along their entire value chain. These regulations apply to not only social, ethical and environmentally friendly procedures, but also the guaranteed protection of human rights.
As an officially certified member of the Responsible Jewellery Council, we guarantee that all of our precious metals and jewels are responsibly sourced. Long-standing partnerships and meticulous evidence on all invoices from our suppliers guarantee that the raw materials (diamonds, gold and platinum) used for our watches come from legitimate sources. The quality of our diamonds is consistently tested and certified by an independent laboratory.


Please find further information about this topic here and download the Supply Chain Policy.

Gehäuse Material

Information on materials used

In the carat system, the quality – or fineness – of precious metals is expressed in carat (karat is the preferred spelling in the USA). The European system, based on one thousand weight units, is also commonplace. The two systems correlate as follows: 18-carat gold is equivalent to 750/000 gold, 21-carat gold is equivalent to 875/000 gold and platinum is 950/000 platinum.  

There is a simple technical reason for the absence of pure gold and pure platinum in horology: both metals are too “soft” for the production of watch and movement components. Gold and platinum are alloyed with other metals to significantly increase their hardness. The different hues of pink, white and honey gold are also achieved by alloying.


Bearing jewels
The reference to “Rubine” on the plates of Lange movements applies to friction-reducing, wear-resistant functional jewels consisting of synthetically produced ruby for bearings, switching and detent elements and the escapement. Because of the greater homogeneity of the crystalline structure as opposed to natural ruby with otherwise virtually identical physical and chemical properties, the use of synthetic ruby is very commonplace in watchmaking today. The English equivalent of the German term “Rubine” is jewels.


View of the three-quarter plate of a timepiece


At A. Lange & Söhne, we have subjected all our purchases of diamonds to the System of Warranties since the scheme was introduced in January 2003. We request a Statement of Warranty to be formalised on every diamond-related invoice we receive. Lange engages in long-term relationships with suppliers who share our values.


Alligator leather

As a long-standing member of the International Reptile Leather Association, A. Lange & Söhne rigorously abides by the Washington Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). The alligator leather used for our straps is sourced exclusively from alligator farms in the USA. Here, alligators are raised pursuant to legal provisions under natural habitat conditions. Trade is also subject to stringent state regulations. The species protection tag attached to the alligator leather strap of a new Lange watch bears a registration number that is checked by customs officials when imported; it allows complete tracking to the manufacturer.