ASYCUDA
  Online Harmonised Commodities Code database

You can enter a keyword or the first few digits from the commodity code, e.g. enter "book" to view commodities with the word book in the description, or enter"490" to view commodities whose code begins with 490.  Commodity codes can be as general as 1 digit or as specific as 6.

Commodities with Heading Code: 7103

Commodity Code Description
Section 14 : Natural or cultured pearls, precious or semi-precious stones, precious metals, metals clad with precious metal and articles thereof; imitation jewellery; coin
   Chapter 71 : Natural or cultured pearls, precious or semi-precious stones, precious metals, metals clad with precious metal and articles thereof; imitation jewellery; coin
     Heading 7103 : 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
710310 Unworked or simply sawn or roughly shaped
710391 Rubies, sapphires and emeralds
710399 Other