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.
(..) ...to retake Erebor. Summon a meeting of the seven Dwarf families. Demand they stand by their oath. The seven armies swore that oath to the one who wields the King's Jewel. The Arkenstone. It is the only thing that will... ...unite them, and in case you have forgotten... ...that jewel was stolen by Smaug. What if I were to help you reclaim it? How? The Arkenstone lies half a world away... ...buried beneath the feet of a fire-breathing dragon. (..)2013 The Hobbit: The Desolation of Smaug