Claim to fame: Lake Superior agates are the oldest agates on earth, formed 1.2 billion years ago. The next oldest are the Montana moss agates, a mere 370 million years old.

The Upper Peninsula of Michigan is an overlooked dreamscape of shoreline, forests, and quietude. And it doesn't get more ...

PREP IT. This is where Korner Gem shines—dreaming up ways to gift and wear these treasures. Gauthier recalls a family arriving with a Lake Superior agate their 16-year-old found when she was three.