Most people don't know it, but the area that surrounds Lake Superior is big business for agate hunters. Kirsten heads to Copper Harbor, MI, to dive for the finest and most colorful gem in the world. The CNT crew heads to Milaca, MN, to comb the area for agates, too. Kirsten and the crew finally make it to Moose Lake, MN, for the Annual Agate Festival to have their finds appraised.