The Connaught Diamond Tiara. Crown Princess Margaret of Sweden, born a princess of Connaught, recived this tiara on her wedding day in 1905. This particular piece was given to Margaret by her parents, Prince Arthur, Duke of Connaught (a son of Queen Victoria) and Princess Louise of Prussia. The delicate tiara features diamond loops from which diamond drops are suspended. Because it was the favorite tiara of the king's mother, this piece is often called "Princess Sibylla's Tiara".