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, PreciousMetals, Metals Clad With Precious Metal, And Article Thereof; immitationJewellery; Coin 71 03 Precious stones (other than diamonds) and semi-precious stones, whether or not worked or graded but not strung, mounted or set; ungraded precious stones (other than diamonds) and semi-precious stones, temporarily strung for convenience of transport Commodity Code Description 71 03 10 UNWORKED OR SIMPLY SAWN OR ROUGHLY SHAPED: 71 03 91 RUBIES, SAPPHIRES AND EMERALDS: 71 03 99 OTHER: