Natural Cornflower Blue Sapphire of Top Quality. Weight 1.63 cts cal. The Round Brilliant Cut Diamonds Also of Top Colour. Est Colour G - H, Est Clarity VSI, Cal Diamond Weight 0.50 pts. Full Hallmark for 750 - 18 ct. Ring Size - M. Comes with Gem Certificate by Cal. Associate of G.I.A. Dated March 21st 2018. Report No 20180386451. Identification Blue Sapphire - Natural Corundum. Cut Faceted Shape Oval, Colour Cornflower Blue. Size 1.63 cts. 7.70 x 6.24 x 4.15.