Definition of crown jewels noun from the Oxford Advanced Learner's Dictionary

 

crown jewels

 noun
noun
BrE
 
; NAmE
 
[plural]
 
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the crown and other objects worn or carried by a king or queen on formal occasions Culture 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. see also Kohinoor
See the Oxford Advanced American Dictionary entry: crown jewels