A SAPPHIRE AND DIAMOND RINGA SAPPHIRE AND DIAMOND RINGSet with an antique cushion-cut sapphire, weighing 6.56 carats, framed by round brilliant-cut diamonds; mounted in platinum; size 5¼Accompanied by a Lotus report stating that the natural sapphire originates from India (Kashmir), cornflower blue colour of intense to rich saturation and medium tone, with no indications of heating/treatment. Report #9021-2372, dated 3 July 2017.Accompanied by a Gübelin report stating that the natural sapphire originates from Sri Lanka (Ceylon), blue colour, with no indications of heating. Also accompanied by an Information Sheet on unheated sapphires. Report #22051002, dated 16 May 2022. 6.56克拉天然未經加熱處理'矢車菊藍'藍寶石配鑽石戒指戒圍5¼,附Lotus及Gübelin證書