14K YELLOW GOLD SEMI MOUNTING WITH PLATINUM 4 PRONG BASKET CROWN SET WITH 1 SQUARE EMERALD CUT SLIGHTLY YELLOWISH GREEN NATURAL EMERALD 4.54CT AND 8 PRINCESS CUT SIDE DIAMONDS WEIGHING APPROXIMATELY 2.78 CTW, I-J COLOR, SI CLARITY FOR 11.5 MM STONE.  AGL REPORT # 1079861 STATES EMERALD ORIGIN IS COLUMBIA