Standard International Trade Classification
U.S. exports of Piezo-Electric Quartz Stones, Not Permanently Strung, Mounted, or Set (SITC 66741) totaled $2.2M in August 2026.
Importers of Piezo-Electric Quartz Stones, Not Permanently Strung, Mounted, or Set paid $173K in duties in August 2026, an average duty rate of 18.37% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 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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60 import shipments a month
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.
Basic heading 66741 · $2.2M of $13.0B
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Exports · August 2026
destination
India and China together take 80% of it.
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$941KYoY · free account
Exports
$2.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $10.7M of Piezo-Electric Quartz Stones, Not Permanently Strung, Mounted, or Set and exported $31.6M.
Through August 2026. Source: U.S. Census Bureau.