Crown Jewels of the United Kingdom
The Crown Jewels of the United Kingdom, originally the Crown Jewels of England, are a collection of royal ceremonial objects kept in the Jewel House at the Tower of London, which include the coronation regalia and vestments worn by British monarchs. The coronation regalia are the only working set in Europe and the collection is the most historically complete of any royal regalia in the world.
Source: Wikipedia — Crown Jewels of the United Kingdom (CC BY-SA 4.0)