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 04 Synthetic or reconstructed precious or semi-precious stones, not set... 71 04 10 Piezo-electrical quartz Commodity Code Description 71 04 10 00 Piezo-electrical quartz