7103.91.00.10 - Rubies

This HTS classification covers rubies, which are precious stones of the corundum mineral species, specifically those colored red by the presence of chromium. These stones, whether cut, polished, or otherwise worked, are classified here as long as they are not strung, mounted, or set into jewelry or other articles. Ungraded rubies are also included under this heading if temporarily strung for ease of transport.

Rubies are distinguished from their sibling categories by their distinct red coloration. Sapphires, classified under 7103.91.00.20, are also of the corundum mineral species but are typically blue, although they can occur in other colors except red. Emeralds, found under 7103.91.00.30, are a variety of beryl characterized by their green color. This classification relies on the specific mineral composition and color to differentiate between these precious gemstones.

As this is a leaf node in the HTS classification, there are no further subcategories under 7103.91.00.10. The classification ends with the broad categorization of worked rubies. Therefore, the practical application of this code hinges on the accurate identification of the gemstone as a ruby and confirmation that it meets the conditions of being worked but not yet assembled into finished articles.