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.
(..) and it's untraceable. Fascinating. You two should exchange notes over coffee. So, now you're tryin' to set me up with a jewel thief... At this point, I'd set you up with a chimpanzee, if it brought you back to the world. - There's nothing out there for me. - And that's the problem. (..)2012 The Dark Knight Rises
(..) Master Wayne? Master Wayne? You haven't been down here in a long time. Trying to find out more about our jewel thief. I ran her... prints. Unless she's lost a lot o' weight... she was wearing someone else's fingerprints. She's... good. She may be, but we have a trace (..)2012 The Dark Knight Rises