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.
(..) Me, bored with you? I'm sorry, darling. It's just that I never realized... how tedious life could be... for a retired jewel thief. Yuck. Clever little beast. Better than the hotel safe. Now tell me, (..)1975 The Return of the Pink Panther
(..) Because of the religious significance of the Pink Panther, it's imperative to the government that sooner or later... the thief be apprehended and the jewel returned. But you would prefer it to be later than sooner? I can't tell you how reassuring it is to know that we understand each other so well. (..)1975 The Return of the Pink Panther