Diamond Crown of Peter the Great, composed of gold, silver, diamonds, emeralds, rubies, tourmaline, sable, and enamel. One of two ceremonial crowns, each set with about 800 diamonds, made for 15-year-old Ivan V (1667 - 1696) and his younger half-brother Peter I (1672 - 1725) at the death of their brother, Tsar Fyodor Alekseyevich, in 1682. It is decorated with a gold two-headed eagle, the Russian emblem, beneath a crown and rosettes of flowers. Large polished emeralds and rubies adorn the crownÕs central peak above the fur trimmings, and a large tourmaline stands beneath the diamond cross. Kremlin workshops, Moscow, 1682 - 1684. Both on loan from the National Palace of the Ajuda Museum, Lisbon.