Akademik

regalia (jewelry and other paraphernalia) worn by a sovereign on state occasions

ˌcrown ˈjewels [crown jewels] noun plural

the crown and other objects worn or carried by a king or queen on formal occasions

The British Crown Jewels are kept for the public to see in the ↑Tower of London and include several crowns, sceptres (= a decorated rod carried as a symbol of power) and swords. Only two small items are from before 1660, as the original Crown Jewels were destroyed during the Commonwealth under Oliver Cromwell.