Section 14 Natural or cultured pearls, precious or semi-precious stones, precious metals, metals clad with precious metal and articles thereof; imitation jewellery; coin 71 Natural or cultured pearls, precious or semi-precious stones, precious metals, metals clad with precious metal and articles thereof; imitation jewellery; coin 71 01 Pearls, natural or cultured, not strung, mounted or set; pearls, natural,..of transport. Commodity Code Description 71 01 10 Natural pearls 71 01 21 Unworked cultured pearls 71 01 22 Worked cultured pearls