藍寶石及鑽石戒指 Forms設計藍寶石及鑽石戒指Forms設計13.22克拉長方形緬甸天然皇家藍藍寶石戒指，附SSEF及Gübelin，配鑽石，鑲金，戒指5 1⁄4號Forms設計Details SAPPHIRE AND DIAMOND RING, MOUNTED BY FORMSOctagonal step-cut sapphire of 13.22 carats, fancy-cut and round diamonds, gold, maker's mark for FormsSSEF, 2015, report no. 82011: 13.223 carats, Burma (Myanmar), no indications of heating, 'royal blue'Gübelin, 2012, report no. 12070179: 13.22 carats, Burma (Myanmar), no indications of heatingSize/Dimensions: US ring size 5 1⁄4 Gross Weight: 8.9 gramsPlease note that the reports are over 5 years old and may require an update.