SAPPHIRE AND DIAMOND RING IN 18KT TWO TONE GOLD SAPPHIRE AND DIAMOND RING 18kt white and yellow gold, embellished at the centre with a cushion-cut sapphire of ct 11.46, flanked by fancy-cut diamonds of ct 1.80, band entirely set with brilliant-cut diamonds of ct 0.20, hallmarked 750 and maker's mark, size 10/50, gr. 7. Accompanied by a GIT (Thailand) certificate dated 13/07/2015 and a certificate of analysis by Dr. Giulio Provera attesting to the characteristics of the sapphire.