~ Harmon's Agate ~

Welcome to Harmon's Agate online shop.

A Small family business, started in 1970, and still going strong today. While we have always dealt with Montana Moss Agate, we also appreciate the beauty in other gemstones found here along the Yellowstone, and around the rest of the world.

Specimens, rough rock, cabochons, and books are just a few of the unique items we have available for you~

Contact us for wholesale inquiries!


*photography on main slides 1-2, photo bubbles 1 & 3 © Tom Shearer