He owns several successful businesses but this company is the 'jewel in the crown'. [=this company is the most valuable/important/admired]
The guests were heavily 'jeweled'. [=the guests were wearing a lot of jewelry]
The building is regarded as one of the 'jewels' of modern architecture.
(..) This is a dream. Then it is a good dream. Sleep. Arwen... Where is she? The woman who gave you that jewel. . Arwen's time is ending. Let her go. Let her take the ship into the west. Let her bear away her love for you (..)2002 The Lord of the Rings: The Two Towers