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Harmonized System
Section XIV > Chapter 71 > Heading 7104
Synthetic or reconstructed precious or semi-precious stones, 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.
Section XIV > Chapter 71 > Heading 7104 > 7104.2
Other, unworked or simply sawn or roughly shaped
Section XIV > Chapter 71 > Heading 7104 > 7104.10
Piezo-electric quartz
Section XVI > Chapter 84 > Heading 8414 > 8414.10
Vacuum pumps