71 Natural, cultured pearls; precious, semi-precious stones; precious metals, metals clad with precious metal, and articles thereof; imitation jewellery; coin
7104 Stones; synthetic or reconstructed precious or semi-precious, whether or not worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport
7104.29Synthetic or reconstructed precious or semi-precious n.e.c. in heading 7104, unworked or simply sawn or roughly shaped