Definition of jewel noun from the Oxford Advanced American Dictionary

     

    jewel

     noun
    noun
    NAmE//ˈdʒuəl//
     
     
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  1. 1a precious stone such as a diamond, ruby, etc. synonym gem
  2. 2 [usually plural] pieces of jewelry or decorative objects that contain precious stones The family jewels are locked away in a safe. see also crown jewels
  3. 3a small precious stone or piece of special glass that is used in the machinery of a watch
  4. 4(informal) a person or thing that is very important or valuable Alice, you are a jewel. Venice is the jewel of the Adriatic. compare gem
  5. Idioms
    the jewel in the crown
     
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    the most attractive or valuable part of something The Madison Avenue branch is the jewel in the crown of a 500-strong chain of stores.
See the Oxford Advanced Learner's Dictionary entry: jewel