Ceylon unheated sapphire diamond 18K yellow gold ring with AGL report; brightly polished, featuring centered prong set round mixed cut blue sapphire, weighing approx. 4.25 carats, accompanied by AGL report 1130349, dated 20 March 2023, indicating the blue sapphire is Natural, of Ceylon origin, with no indications of heat treatment or any additional enhancement, surrounded by 10 prong set round brilliant cut diamonds, weighing a total of approx. 1.60 carats, marked: "18K". Measuring approx US size 6, approx. 3/4" across widest point, approx. 4.7 dwt. Provenance: Property from the Manhattan estate of Indrani Yogasundram who lived in many different countries with her husband, Yogaraj, during his decades-long career as a Sri Lankan diplomat. In addition to the heirloom jewelry she possessed, Indrani acquired jewelry, art, and ornaments while stationed in China (1960-63), Sri Lanka (1963-65), and Iraq (1965-1967).