RENE BOIVIN Elegant crossed ring in 750°/°°° gold and platinum set with a 6.31 ct brilliant-cut diamond J SI2 to a design by Marie Caroline de Brosses. Traces of hallmark, chips TDD with spring ring: 51 Gross weight: 19g Ring accompanied by 2 certificates: - Certificate from Thomas Torrini Levene, owner of the BOIVIN archives - Certificate from Laboratoires Francais Gemmologie "Boivin jewellery is eternally contemporary. It has style, it has style" Marie Caroline de Brosses 2017 Marie Caroline de Brosses was the designer in charge of creation at René Boivin from 1970 to 1980. Her highly sensual jewellery combines original shapes and the use of unexpected materials.