RING in platinum (850 thousandths), stylizing a flower adorned with a square-cut emerald in a claw setting, the petals set with brilliant-cut diamonds. Openwork ring body, bezel in yellow gold (750 thousandths). French work circa 1960/65. Master mark RD for Robert Duhem. Comes with case. Emerald weight: approx. 3.40 cts. Gross weight: 13.60 g. - Finger size: approx. 53 (with setting ring). Jewel accompanied by a GEM Paris certificate n° 20251978509 dated 07.11.2025, attesting to the emerald's Colombian origin, its appearance designated as "Gota de Aceite" or "Aleta de Mariposa", modified by a slight oil impregnation that does not appreciably affect the stone's appearance. Robert Duhem, Créateur-Bijoutier-Fabricant, 43 rue Saint- Augustin - Paris. "He was one of BULGARI's main subcontractors and, as a designer, left his mark on the House's style". Bibliography: Dictionnaire des Joailliers, bijoutiers et orfèvres en France de 1850 à nos jours, by Remi Verlet, published by Éditions Gallimard - L'École des Arts Joailliers.