Product classification

HS code for Synthetic gemstones: 7104.91

Stones, diamonds, n.e.c. in heading 7104, worked or graded but not strung, mounted or set, ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport.

Classification of synthetic gemstones under HS 7104.91

Synthetic gemstones, specifically worked synthetic diamonds, are classified under HS code 7104.91. This heading covers stones that have been produced in a laboratory but possess the same chemical, physical, and optical properties as natural diamonds. The 'worked' designation means the stones have been cut, polished, or faceted, but they are not yet set or mounted into jewelry. This classification is distinct from 'unworked' stones (7104.21) and 'reconstructed' stones. The process of creation—whether Chemical Vapor Deposition (CVD) or High Pressure High Temperature (HPHT)—does not affect the HS code, provided the end result is a synthetic diamond. This code is essential for the jewelry industry to distinguish between natural and lab-grown diamonds for both regulatory and valuation purposes. The stones may be temporarily strung for transport convenience without losing this classification, provided they are not permanently set.

Covers
  • Lab-grown faceted diamonds
  • Polished synthetic industrial diamonds
  • CVD (Chemical Vapor Deposition) worked diamonds
  • HPHT (High Pressure High Temperature) worked diamonds
  • Synthetic diamond melee (cut and polished)
Also under 7104.91
  • GIA certified diamonds
  • Forevermark diamonds (loose)
  • various wholesale diamond dealers
  • Graff Diamonds (for high-end loose stones)

Codes often confused with 7104.91

Common mistake. Synthetic diamonds are often misclassified under 7102, which is strictly for natural diamonds. Another common error is using 7104.99, which is the 'other' category for synthetic stones like rubies, sapphires, or emeralds. If the synthetic diamond is already mounted in a ring or necklace, it must be classified under 7113 (Articles of jewelry). Finally, imitation diamonds (like Cubic Zirconia), which are chemically different from carbon diamonds, are classified under 7104.99 or 7018 if made of glass.

7104.10Stones; piezo-electric quartz, whether or not worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport71.02Diamonds, whether or not worked, but not mounted or set7104.99Stones; synthetic or reconstructed precious or semi-precious n.e.c. in heading 7104, worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport71.13Jewellery articles and parts thereof, of precious metal or of metal clad with precious metal70.18Glass beads, imitation pearls, precious or semi-precious stones and similar glass smallwares, statuettes and other ornaments of worked glass; glass microspheres not exceeding 1mm in diameter

Top exporters and importers of HS 710491 (the code used for synthetic gemstones), 2025

In 2025, the largest exporter of HS 710491 (the code used for synthetic gemstones) in UN Comtrade data was India, with 63% of world exports; the largest importer in UN Comtrade data was the United States, with 30% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Figures cover everything classified under HS 710491, not only synthetic gemstones.

Top exporters 2025 · share of world exports

  1. 1 India $1.2B
  2. 2 Hong Kong $284M
  3. 3 United States $123M

World total: $1.9B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 United States $568M
  2. 2 Hong Kong $365M
  3. 3 China $252M

World total: $1.9B Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM code for synthetic gemstones

Brazil classifies synthetic gemstones under NCM 7104.91.00: HS 7104.91 with 00 added.

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about synthetic gemstones

What is the HS code for Synthetic gemstones?

The HS code for Synthetic gemstones is 710491 (Stones; diamonds, n.e.c. in heading 7104, worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport).

How do I classify Synthetic gemstones for customs?

Synthetic gemstones is classified under HS code 710491 — Stones; diamonds, n.e.c. in heading 7104, worked or graded but not strung, mounted or set; ungraded synthetic or reconstructed precious or semi-precious stones, temporarily strung for convenience of transport. This is a 6-digit subheading level code.

What is the HS code for synthetic diamonds?

The HS code for worked, but unset, synthetic diamonds is 7104.91.

Is a lab-grown diamond considered 'imitation' in the HS system?

No, the HS system distinguishes between 'synthetic' (chemically identical) and 'imitation' (chemically different). Lab-grown diamonds are 'synthetic' and fall under 7104.

Which countries are the top exporters of synthetic gemstones (HS 710491)?

In 2025, the top exporters of HS 710491 (the code used for synthetic gemstones) in UN Comtrade data were India ($1.2B, 63% of world exports), Hong Kong ($284M) and the United States ($123M). World exports came to about $1.9B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of synthetic gemstones (HS 710491)?

In 2025, the top importers of HS 710491 (the code used for synthetic gemstones) in UN Comtrade data were the United States ($568M, 30% of world imports), Hong Kong ($365M) and China ($252M). World imports came to about $1.9B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Is the HS code for Synthetic gemstones the same in all countries?

The base HS code 710491 for Synthetic gemstones is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.

What is the NCM code for synthetic gemstones in Brazil?

In Brazil, synthetic gemstones (HS 710491) is classified under NCM 7104.91.00.