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 met Jewellery; Co 71 07 Base metals clad with silver, not further worked than semi-manufactured 71 07 00 Base metals clad with silver, not further worked than semimanufactured. Commodity Code Description 71 07 00 00 Base metals clad with silver, not further worked than semimanufactured.