A tasty leaf we love to see on top every salad and pizza dish we eat

I'm larger than a pond but smaller than a sea. England named an entire district after me.

Hidden in a shell, a treasure lies beneath; silent keeper of pearls, beneath the ocean's breadth. One can me up, or a case closed with a slam; Forty to two hundred eyes, can you guess who I am.

I hold two circles that bring far things near with adjustable focus to make distant sites clear hunters and birdwatchers know me well I'm there trusty companion with stories to tell strap me around your neck raise me Up high I'll double your eyes

You think you have daddy issues? Mine snaps all the time and makes me blue