 It is one of only ten Imperial eggs that were not sold following the Russian Revolution and subsequent execution of the immediate Imperial Romanov family, and is now held in the collection of the Kremlin Armoury.The exterior of the egg is made of gold and steel— unlike many previous eggs, the exterior had no gemstones set in it anywhere— and was once coated in vitreous enamel, while the interior is made of silk and velvet.The egg stands on a base of jade and is supported by four steel artillery shells.