Tower of London: White Towers fearsome exterior conceals some hidden gems, such as Henry VIIIs armour and the beautiful 11th-century Chapel of St John the Evangelist. Also Daily in the White Tower, see the history of the tower. The collection of Crown Jewels has 23,578 in total. There are 23,578 gems that make up the Crown Jewels, including the Imperial State Crown, which alone has 2,868 diamonds, 273 pearls, 17 sapphires, 11 emeralds and 5 rubies. The Tower Green contains the evocative memorial to the people who died by order of the state.