This industry comprises establishments primarily engaged in the merchant wholesale distribution of jewelry, precious and semiprecious stones, precious metals and metal flatware, costume jewelry, watches, clocks, silverware, and/or jewelers' findings. Cross-References. Establishments primarily engaged in-- ? Merchant wholesale distribution of precious metal ores or concentrates--are classified in Industry 423520, Coal and Other Mineral and Ore Merchant Wholesalers; and ? Merchant wholesale distribution of nonprecious flatware--are classified in Industry 423220, Home Furnishing Merchant Wholesalers.