7104.10.00.00 - Piezo-electric quartz

This HTS category, 7104.10.00.00, specifically covers piezo-electric quartz. Piezo-electric quartz is a synthetic or reconstructed gemstone possessing the unique property of generating an electric charge in response to applied mechanical stress, or conversely, deforming mechanically when an electric field is applied. While this category falls under the broader heading for synthetic or reconstructed precious or semi-precious stones, it is distinguished by its specific functional property related to electrical activity.

Unlike the sibling categories which broadly cover "Other, unworked or simply sawn or roughly shaped" or simply "Other" synthetic or reconstructed stones, this category is defined by a specific, engineered characteristic. The emphasis is on the material's inherent piezo-electric capability, rather than its general form or stage of processing. This functional attribute is the primary criterion for classification within this specific sub-heading.

As a leaf node, this category does not have further subdivisions. Therefore, the classification hinges entirely on the identification of the material as piezo-electric quartz, whether it is unworked, cut, polished, or graded, provided it is not already strung, mounted, or set. Examples of items that would fall here include raw synthetic piezo-electric quartz crystals or finished piezo-electric quartz elements intended for use in electronic devices, sensors, or oscillators.