RARE COLOURED SAPPHIRE AND DIAMOND RING Oval-shaped purple sapphire of 15.97 carats, fancy and circular-cut diamonds, gold, ring size 5? SSEF, 2018, report no. 99027: 15.975 carats, Burma, no indication of heating AGL, 2018, report no. 8087260: 15.97 carats, origin not determinable, no heat and clarity enhancement US$150,000-230,000