Roman+Jules This one-of-a-kind ring features a natural, cushion-cut cornflower blue sapphire gemstone with a diamond halo in an 18K white gold setting. It weighs 6.3 grams and measures 17.5 mm x 13.4 mm at the head, with a 2mm shank. Certified by CD Switzerland with report number CDC1905547, the 5.30ct sapphire hails from Ceylon and features a very good clarity and mix cut cushion cut. 14 brilliant cut diamonds are F in color and VS-SI in clarity, 1.13 CTW with excellent make and polish. The ring is size 5.3/4.