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.
(..) You know, go someplace to heal. Where? Well, someplace with a vibrant theater scene... Top-notch restaurants... The jewel of Missouri's white river. We're not going to Branson. Okay, fine. Where would you go? I don't know. Maybe Europe? (..)2012 TvShow: Modern Family Title: Bringing Up Baby Season: 4 Episode 1