Grown Diamond Substrate from Japan
CVD-grown single-crystal diamond substrate weighing more than 2.5g, used in electronics heat sinks. Classified in HTS 3824.99.1900 as cultured crystals not elsewhere specified. Synthetic lab-grown for high thermal conductivity applications.
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
Import Tips
• Submit CVD growth process documentation and gemological certification proving synthetic origin
• Weigh and declare each substrate individually to meet 2.5g threshold