COLUMBIAN EMERALD AND DIAMOND RING IN 18KT WHITE GOLD COLOMBIAN EMERALD AND DIAMOND RING 18kt white gold, embellished at the centre with an octagonal-cut emerald weighing 2.09 ct, flanked by triangle-cut diamonds weighing approximately 0.50 ct, size 16/56, g. 3. Accompanied by an IGN certificate dated 07/05/2024 attesting to the characteristics and geographical origin of the emerald.