As a long-standing member of the “Internationaler Reptilleder Verband” (IRV), A. Lange & Söhne rigorously abides by the Washington Convention on International Trade in Endangered Species (CITES). The crocodile leather used for our straps is sourced exclusively from alligator farms in the USA where ethical animal husbandry principles are upheld. The leather trade is strictly monitored as well. The species protection seal on the crocodile strap of a new Lange watch includes a registration number that is checked by customs officials when imported; it allows each strap to be traced back to the source.

Owners of a Lange watch can be certain that their timepieces do not bear any diamonds that were mined or traded under inhumane circumstances. This is assured by well-established partnerships with our suppliers. Every invoice for every precious stone contains an affidavit that it comes from legitimate sources. Moreover, our diamond purchases are governed by the System of Warranties, a strict monitoring practice under the auspices of the Kimberley Process Certification Scheme. In particular, we can expressly assure that none of the diamonds we buy comes from Marange in Zimbabwe or Myanmar, regions that have come under criticism for serious human rights violations. Additionally, an independent laboratory verifies the quality of all diamonds that we purchase.