LONDON, UK – Media OutReach Newswire – 30 March 2026 – Poppy Delevingne, Nathalie Emmanuel, and Archie Madekwe attended De Beers' reception held at Maison Assouline, a destination for culture, in celebration of the newly launched book, A Diamond Is Forever: The Making of a Cultural Icon 1926 – 2026. De Beers Group CEO Al Cook delivered a speech at the event, joining Sotheby's to unveil the rare natural diamond Jwaneng 28.88 and celebrated the launch of the new book, "A Diamond Is Forever: The Making of a Cultural Icon 1926-2026".Commissioned by Al Cook De Beers Group CEO, the book…