7102.21.10.10/Natural Carbonado Diamond/Japan

Natural Carbonado Diamond from Japan

Carbonado diamonds are a rare polycrystalline form of diamond known as black diamonds, used primarily in industrial applications due to their extreme toughness and opacity. They fall under HTS 7102.21.10.10 as unworked or simply sawn, cleaved, or bruted miner's diamonds specifically classified as carbonados. These are not gem-quality diamonds but valued for their durability in cutting tools and drilling.

Duty Rate — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter

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Import Tips

• Verify authenticity with GIA or similar certification to confirm carbonado classification and avoid gem diamond scrutiny

• Provide detailed documentation on origin and processing level (unworked/sawn) to prevent misclassification as worked diamonds

• Declare exact weight and sieve test if powdered form approaches subheading thresholds for powder definitions