Product classification
HS code for Uncut diamonds: 7104.21
Stones, diamonds, unworked or simply sawn or roughly shaped.
Classification of uncut diamonds under HS 7104.21
HS code 710421 is used for synthetic diamonds that are in their primary, unworked state. Synthetic diamonds, also known as laboratory-grown or cultured diamonds, are produced using technological processes such as High Pressure High Temperature (HPHT) or Chemical Vapor Deposition (CVD). This specific code covers these stones when they have only been roughly shaped, sawn, or cleaved from the original growth crystal. They have not yet been faceted, polished, or prepared for setting into jewelry. The classification is vital for customs and trade monitoring to differentiate between natural mineral diamonds and those created through industrial means, as well as to distinguish between raw materials and finished gemstones. Because synthetic diamonds have the same physical and chemical properties as natural diamonds, documentation such as laboratory reports is often required to justify the use of heading 7104 instead of 7102. This code ensures that the trade of lab-grown rough is tracked separately from the natural diamond supply chain. The unworked status is strictly interpreted. If a synthetic diamond has been laser-cut into a specific shape that resembles a finished gemstone, it may be moved to 710491. This code is primarily for the industrial rough that serves as the starting point for the jewelry or abrasive manufacturing sectors.
- Covers
- Lab-grown diamond rough crystals
- Sawn synthetic diamond blocks
- Roughly shaped laboratory diamonds
- Unworked HPHT or CVD diamond seeds
- Also under 7104.21
- De Beers (rough diamond sales)
- Alrosa (rough diamond production)
- Petra Diamonds
- Rio Tinto
Codes often confused with 7104.21
Common mistake. The most frequent misclassification is with 710210, which is for natural uncut diamonds. It is also confused with 710491, which covers synthetic diamonds that have been worked (cut or polished). Industrial-grade synthetic diamond powder should be classified under 710510.
Top exporters and importers of HS 710421 (the code used for uncut diamonds), 2025
In 2025, the largest exporter of HS 710421 (the code used for uncut diamonds) in UN Comtrade data was Hong Kong, with 44% of world exports; the largest importer in UN Comtrade data was India, with 59% 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 710421, not only uncut diamonds.
Top exporters 2025 · share of world exports
- 1 Hong Kong $601M 44% of world exports
- 2 China $295M 22% of world exports
- 3 United Arab Emirates* ~$175M 13% of world exports · partner records ↗
World total: $1.4B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 India $961M 59% of world imports
- 2 Hong Kong $340M 21% of world imports
- 3 United Arab Emirates* ~$279M 17% of world imports · partner records ↗
World total: $1.6B 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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 uncut diamonds
Brazil classifies uncut diamonds under NCM 7104.21.00: HS 7104.21 with 00 added.
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about uncut diamonds
What is the HS code for Uncut diamonds?
The HS code for Uncut diamonds is 710421 (Stones; diamonds, unworked or simply sawn or roughly shaped).
How do I classify Uncut diamonds for customs?
Uncut diamonds is classified under HS code 710421 — Stones; diamonds, unworked or simply sawn or roughly shaped. This is a 6-digit subheading level code.
What is the HS code for uncut synthetic diamonds?
The HS code for unworked or roughly shaped synthetic diamonds is 710421.
Does 710421 include natural diamonds?
No, natural diamonds are classified under heading 7102; 7104 is strictly for synthetic or reconstructed stones.
Which countries are the top exporters of uncut diamonds (HS 710421)?
In 2025, the top exporters of HS 710421 (the code used for uncut diamonds) in UN Comtrade data were Hong Kong ($601M, 44% of world exports), China ($295M) and the United Arab Emirates (about $175M). World exports came to about $1.4B, 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 uncut diamonds (HS 710421)?
In 2025, the top importers of HS 710421 (the code used for uncut diamonds) in UN Comtrade data were India ($961M, 59% of world imports), Hong Kong ($340M) and the United Arab Emirates (about $279M). World imports came to about $1.6B, 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 Uncut diamonds the same in all countries?
The base HS code 710421 for Uncut diamonds 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 uncut diamonds in Brazil?
In Brazil, uncut diamonds (HS 710421) is classified under NCM 7104.21.00.