Black Carbonado Aggregates from Japan
Black carbonado diamond aggregates, known as black diamonds in mining circles, used exclusively for high-pressure industrial cutting and grinding. Under HTS 7102.29.00.10 as carbonados, these porous diamond masses exceed 2% carbon purity but lack gem brilliance. Sourced primarily from Brazil and Central Africa.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Require X-ray diffraction certificates proving polycrystalline diamond structure to distinguish from graphite or other carbon forms
• Declare exact parcel weights; carbonados often imported in 1-10 carat miner parcels prone to undervaluation scrutiny
• Note Brazilian origin quotas may apply; verify CITES compliance though carbonado exempt from diamond trade controls