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.
(..) he/she gave with itself piece in the street, without further ado. Now, she had the revenge of the breaking. An embarrassing one and public auction of all of the jewels that he gave him/her, Here it is. My bebé. - It is beautiful. - When I saw her/it in the catalog told Smith: (..)2008 Sex and the City