crown

the jewel in the crown

the best or most valuable thing in a group of things. The island of Tresco, with its beautiful tropical gardens, is the jewel in the crown of the Scilly Isles. (often + of)

to cap/crown/top it all

something that you say when you want to tell someone the worst event in a series of bad events that has happened to you. He spilled red wine on the carpet, insulted my mother, and to cap it all, broke my favourite vase.

See also: all, cap, top

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the jewel in the crown

the best or most valuable thing in a group. This college is the jewel in the crown of the city's university.