A recap of Denver's Hardrock Summit, a dual-format trade show geared to gem, jewelry, and mineral lovers. <<Made up of two distinct events—Evolution, a showcase for rarefied minerals, at the Colorado Convention Center, and Sparkle & Joy, an exhibition of gems and jewels at the nearby Sheraton Downtown Denver—the doubleheader marked not only the debut of a new fall event on the gem and jewelry calendar, but it also featured a new hybrid approach to selling: The summit was open to both trade and consumer buyers.>>