The Rockefeller Emerald, a rare, mesmerizing 18.04 carat octagonal step-cut Colombian emerald set in a platinum and diamond ring, was recently sold at auction by Christie’s New York. It was purchased by Harry Winston for over US$5.5 million, setting a world auction record for price per carat for an emerald. The historic ring, designed by Raymond Yard in 1948, was previously owned by the Rockefeller family. Courtesy: Christie's
Carlos Castillo is a graduate from the prestigious Gemological Institute of America (GIA) and the University of New Orleans.