As Princess Eugenie exchanged wedding vows with Jack Brooksbank on Friday at St. George’s Chapel in Windsor Castle, England, all eyes were on her magnificent emerald tiara. Dubbed the Greville Emerald Kokoshnik Tiara, the diamond-encrusted platinum headpiece features a 93.7-carat oval-shaped emerald center stone flanked by six additional emeralds on each side. Jewelry experts have […]