421940 Jewelry, Watch, Precious Stone, and Precious Metal Wholesalers This U.S. industry comprises establishments primarily engaged in wholesaling jewelry, precious and semiprecious stones, precious metals and metal flatware, costume jewelry, watches, clocks, silverware, and/or jewelers' findings. The data published with NAICS code 421940 include the following SIC industry: 5094 Jewelry, watches, precious stones, and precious metals