Standard International Trade Classification
U.S. exports of Worked Synthetic or Reconstructed Precious & Semiprecious Stones, NES (SITC 66749) totaled $84.9M in August 2026.
Importers of Worked Synthetic or Reconstructed Precious & Semiprecious Stones, NES paid $2.7M in duties in August 2026, an average duty rate of 10.18% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Worked Synthetic or Reconstructed Precious & Semiprecious Stones, NES imports of $26.6M in August 2026 ran 18% above the year-to-date monthly average of $22.6M.
Last updated: August 2026 dataFaceted, polished, or otherwise finished synthetic and reconstructed gemstones — not elsewhere specified and excluding piezo-electric quartz — that are loose or only temporarily strung for transport occupy this residual category, capturing the broad range of lab-created colored stones after processing but before mounting. The 'not elsewhere specified' qualifier means importers must first confirm the stone does not fit a more specific synthetic-stone heading before landing here. Cubic zirconia, synthetic moissanite (when not classified as a diamond simulant under a more specific provision), and reconstructed turquoise or lapis are examples of materials that may route through this heading depending on their processing state. Because synthetic stones are frequently used as diamond simulants, CBP may scrutinize shipments to verify that natural diamonds are not being misclassified as synthetics to reduce duty or evade Kimberley Process requirements.
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726 import shipments a month
The NES designation means this heading is a catch-all: importers should first check whether the specific stone type (e.g., synthetic diamond, piezo-electric quartz) has its own dedicated classification. If no more specific provision applies and the stone is synthetic or reconstructed, worked, and not permanently strung or set, this heading is appropriate. A binding ruling request to CBP is advisable for novel or ambiguous synthetic materials.
The primary concern is misclassification of natural diamonds as synthetic stones to reduce dutiable value or circumvent Kimberley Process documentation requirements. CBP may request laboratory analysis or grading certificates to confirm synthetic origin. Importers should retain manufacturer certificates, spectroscopic test results, or recognized lab reports that positively identify the stones as lab-created.
Basic heading 36 of 766 in section 6
Basic heading 66749 · $84.9M of $13.0B
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Exports · August 2026
destination
South Korea and India together take 92% 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
$26.6MYoY · free account
Exports
$84.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $214.3M of Worked Synthetic or Reconstructed Precious & Semiprecious Stones, NES and exported $196.5M.
Through August 2026. Source: U.S. Census Bureau.