Charles Darwin & Alfred Wallace cufflinks Portraits of Charles Darwin & Alfred Wallace, bronze tone cufflinks £18.00 £18.00 Add To Basket The two authors of the theory of evolution by natural selection: Charles Darwin and Alfred Russel Wallace. Images from the Wellcome Collection. These are bronze tone cufflinks; the glass cabochon is 18mm across and the cufflink base, 20mm. The metal is a copper-based metal alloy and is lead and nickel safe. All cufflinks come in a sturdy black textured-card gift box. Please note that glass cabochon images are water-resistant but not waterproof; please keep away from prolonged contact with water.