Kot 204. A Colombian emerald weighing approximately 23.34 carats, and diamond ring. Estimate USD 240,000 - USD 600,000. © Christie’s Images Limited 2018.

Set with a square cushion-cut emerald, weighing approximately 23.34 carats, flanked on either side by a pair of trapezoid-cut diamonds and square-cut diamond half-hoop, enhanced by a circular-cut diamond gallery, ring size 6 1/2, mounted in platinum.