Synthetic or reconstructed precious or semiprecious stones, whether or not worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semiprecious stones, temporarily strung for convenience of transport:

Piezo-electric quartz

Pearls, natural or cultured, whether or not worked or graded but not strung, mounted or set; pearls, natural or cultured, temporarily strung for convenience of transport:

Diamonds, whether or not worked, but not mounted or set:

Precious stones (other than diamonds) and semiprecious stones, whether or not worked or graded but not strung, mounted or set; ungraded precious stones (other than diamonds) and semiprecious stones, temporarily strung for convenience of transport:

Dust and powder of natural or synthetic precious or semi- precious stones:

Silver (including silver plated with gold or platinum), unwrought or in semimanufactured forms, or in powder form:

Base metals clad with silver, not further worked than semi- manufactured