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 orsemi-precious stones, whether or notworked or graded but not strung, mountedor set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport. Commodity Code Description 71 04 10 Piezo-electric quartz 71 04 20 Other, unworked or simply sawn or roughly shaped 71 04 21 Diamonds 71 04 29 Other 71 04 90 Other 71 04 91 Diamonds 71 04 99 Other