be the jewel in the crown

To be prized as the best, most valuable, or most important person or thing of someone's or something's kind. Likened to a precious jewel that is featured on a monarch's or sovereign's regalia. I have a large collection of vintage cars, but this 1965 Corvette Stingray is the jewel in the crown. I've always considered Shakespeare to be the jewel of the crown when it comes to English drama. If you ask me, Ella's the jewel in the crown. She's by far the most talented person in the company.