Romanov jewellery: this is a 136 carat emerald "The Green Queen". Decorated by diamonds. It belonged to Nikolai of Russia and later in to GD Alexandra Iosifovna, wife of Nikolay II relative. Today is kept in the Diamond Fund, Moscow Kremlin.
Nikola Tesla: 1856 – January 7 Serbian American inventor, electrical engineer, mechanical engineer, physicist, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system.
The Russian Imperial Crown. First used at the Coronation of Catherine the Great and last used at the coronation of Nicholas II. The magnificent crown holds the second largest spinel in the world, a precious red spinel weighing an impressive carats.