jewel in the crown and variants: a particularly important, exceptional, or valuable feature or aspect of something; esp. (in early use) a…

figurative and in figurative contexts. Frequently in extended metaphors. A particularly important, notable, or valuable feature or aspect of…

Any conspicuous or salient point or matter. Obsolete.

Of immaterial things, qualities, etc.: Standing out from the rest; prominent, conspicuous; often in salient point (cf. A. 3). Also Psychology…

figurative. A prominent or outstanding feature or characteristic; an exceptional or the best part of an event or period of time.

The most enjoyable or important part of an experience or period in time. Cf. highlight, n. 3.

figurative.