Svetlana Chestnykh spends her days in the state or museum archives of St. Petersburg poring over bills, newspapers, letters and photographs from the tsarist era. Documentation she found helped boost the price of a Faberge parasol knob to $80,500 at Sotheby’s New York last November. Bills she dug up showed Tsar Nicholas II and Empress Alexandra Fedorovna purchased the gem-set object for 185 rubles on Oct. 28, […]