Harmonized System
U.S. exports of Synthetic Diamonds, Worked but Not Mounted or Set (HS 710491) totaled $84.2M in August 2026.
Importers of Synthetic Diamonds, Worked but Not Mounted or Set paid $2.5M in duties in August 2026, an average duty rate of 10.02% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Synthetic Diamonds, Worked but Not Mounted or Set imports of $25.2M in August 2026 ran 26% above the year-to-date monthly average of $20.0M.
Last updated: August 2026 dataWorked synthetic diamonds that have been cut, faceted, or otherwise processed but remain loose — not set in jewelry or mounted — split into two US tariff lines based on suitability for jewelry: 7104911000 for stones cut for jewelry use, and 7104915000 for those worked but not suitable for jewelry (typically industrial or technical grades). India dominates supply at this stage, consistent with its role as the world's primary diamond cutting and polishing hub; the United Arab Emirates and Thailand are also significant sources. Importers should be aware that the jewelry-suitability distinction is a classification judgment that can affect duty treatment and should be supported by documentation.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
624 import shipments a month
CBP generally looks at the stone's cut quality, clarity, size, and commercial presentation. Stones with gem-quality faceting, polish, and proportions consistent with jewelry use are classified under 7104911000. Irregularly shaped, heavily included, or industrially processed stones — such as those used in wire-drawing dies or dressing tools — fall under 7104915000. Importers should retain grading reports or manufacturer specifications to support the classification.
India's diamond cutting and polishing industry, centered in Surat, processes the vast majority of the world's loose diamonds — both natural and synthetic. The infrastructure, skilled labor, and trade networks built around natural diamond polishing have been adapted to lab-grown stones, making India the dominant source for cut-but-unset synthetic diamonds entering the US market.
Trade Directory
List your company under HS 710491 — Synthetic Diamonds, Worked but Not Mounted or Set, so the companies trading it can find you. Be the first supplier listed.
Subheading 1 of 5 in heading 7104
Subheading 710491 · $84.2M of $102.7M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7104911000 | Syn/ Recon, Diamonds, Cut But not Set for Jewelry | $24.8M | 9.99% | 99.16% | $2.5M |
| 7104915000 | Syn, Rcnstr Diamonds Wrkd Nt Suitbl for Jewelry | $358K | 11.55% | 74.96% | $41K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7104911000 | Syn/ Recon, Diamonds, Cut But not Set for Jewelry | $82.8M |
| 7104915000 | Syn, Rcnstr Diamonds Wrkd Nt Suitbl for Jewelry | $1.4M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$25.2MYoY · free account
Exports
$84.2MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $189.1M of Synthetic Diamonds, Worked but Not Mounted or Set and exported $188.3M.
Through August 2026. Source: U.S. Census Bureau.
Exports · August 2026
destination
South Korea and India together take 93% of it.
customs district
origin
entry
rate provision · imports
1.2% enters free of duty; duty collected equals 10.02% of imports for consumption.