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.
(..) Two cards. I just got out of prison. -Really? -Why were you in prison? I stole things. You stole things? Like jewels? Incan matrimonial head masks. -Any money in lncan matrimonial--? -Head masks. Some. Don't let him fool you. There's loads if you can move them. (..)2001 Ocean's Eleven