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SITCSection 6
U.S. imports of piezo-electric quartz stones, not permanently strung, mounted, or set (SITC 66741) totaled $1.1M in April 2026, traded with 12 countries.
Importers of Piezo-Electric Quartz Stones, Not Permanently Strung, Mounted, or Set paid $185K in duties in April 2026 — an effective duty rate of 18% on $1.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Piezo-Electric Quartz Stones, Not Permanently Strung, Mounted, or Set imports of $1.1M in April 2026 ran 36% above the year-to-date monthly average of $790K.
Last updated: April 2026 dataPiezo-electric quartz — the specialized crystalline form of quartz whose mechanical-to-electrical conversion properties make it indispensable in oscillators, sensors, sonar transducers, and precision timing devices — is carved out from general gemstone classifications because its primary value is functional rather than ornamental. The distinction between piezo-electric quartz and decorative quartz varieties (rose quartz, amethyst, citrine) is material to classification: only stones with confirmed piezo-electric characteristics belong here. Defense and aerospace electronics supply chains are significant end-use sectors, and some grades of piezo-electric quartz have historically been subject to strategic-material considerations. Importers should document the crystal's grade and intended electronic application to support classification and avoid misrouting to decorative-stone headings.
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The classification turns on the crystal's functional property — its ability to generate an electric charge under mechanical stress — rather than its appearance. Importers should provide technical specifications, certificates of grade (such as lumbered or cultured quartz grades used in electronics), and end-use documentation confirming the material is destined for oscillator, sensor, or transducer manufacturing rather than decorative use.
Piezo-electric quartz used in defense-related electronics can intersect with export-control regimes on the supplier side, and importers sourcing from certain origins should verify that the foreign exporter has complied with applicable controls. On the US import side, no blanket Section 301 or Section 232 measure applies to this heading as a category, but importers should confirm current tariff treatment with a licensed customs broker given the specialized nature of the product.
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Monthly import values over time