Diamond Crown of Bulgaria

The Diamond Crown of Bulgaria is the only royal regalia (along with the Sceptres of Ferdinand I and Boris III), that existed during the Bulgaria monarchy from 1878 to 1946. The crown was made for the first wife of Ferdinand I, Marie Louise in late 19th century (used later also by Eleanore of Reuss-Köstritz, the second wife of Ferdinand I). The current whereabouts of the crown is unknown.