Catherine wore Kiki Classic Green Amethyst Cushion Drop & Diamond Hoop Earrings for the St. Patrick’s Day Parade in 2014. 18K Yellow Gold Classics Cushion-Cut Green Amethyst & Diamond Drop Earrings dangling from gold and diamond hoop. The look of two in one. Wear the hoops alone or with gem. The earrings are currently retailing for £1,169.