Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)

Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)

Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)

Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)

Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)

Imitation of the crown of Russian Empress Catherine II mounted with 110,000 diamonds is unveiled at the International Jewellery Exhibition in St. Peterburg, Russia, on Feb. 6, 2013. (Xinhua/Zmeyev)