R. Harder Gallery of Gems & Minerals
Located in the lobby of our headquarters in Neenah, Wisc., the R. Harder Gallery of Gems & Minerals is home to one of the nation's largest private collections of minerals and gemstones that are “in matrix,” meaning they’re still embedded within the rock in which they naturally formed. Featuring over 260 specimens, the collection is valued at more than $1 million, and offers a rare glimpse into the worlds of geology and gemology. Since 1994, Jewelers Mutual has been curating this extraordinary collection, which is open to the public during regular business hours. Guided tours are also available by appointment.