Octagonal step-cut sapphire of 8.14 carats, round diamonds, French assay marks for platinum (950‰) and 18K white gold (750‰), signed René Boivin, French maker’s mark (Société René Boivin), 1976, René Boivin fitted case SSEF, 2025, report n°149441: 8.141 carats, Ceylon (Sri Lanka), no indications of heating Maison René Boivin, 2025: Certificate of Authenticity n°202512YRE, original piece manufactured by René Boivin in October 1976 after a drawing by Marie-Caroline de Brosses Diamonds: for an approximate total weight of 1.70-1.90 carat Size/Dimensions: EU ring size 501⁄2/ US ring size 51⁄4 Gross weight: 16.18 grams