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.

Home to a 108-pound agate, Moose Lake has earned the title "Agate Capital of the World." A former naturalist explains why.

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.

PETOSKEY — Michigan is a rock hound’s paradise. From the Leland Blue, a stone-like slag leftover from the iron ore and mining industry, to the glowing Yooperlite and Lake Superior agates found ...

MINNEAPOLIS — Lake Superior is the largest freshwater lake in the world — a sea known for its pristine cold water. But in a warming world, that's changing.