铂金镶嵌16.31克拉枕形切割蓝宝石,配镶圆形切割钻石,指环尺寸6 1/2附SSEF及GRS证书 Accompanied by report no. 104603 dated 21 January 2019 from SSEF stating that the 16.31 carat sapphire is of Burma origin, with no indications of heatingAlso accompanied by report no. GRS2016-116528 dated 18 November 2016 from GRS stating that the 16.31 carat sapphire is of Burma (Myanmar) origin, GRS type “Royal blue”, with no indication of thermal treatment