US imports of cut lab-grown diamonds, by month

Monthly customs value of US imports of LOOSE cut lab-grown diamonds under HTS 7104.91.10.00, in millions of US dollars. Loose stones only: lab-grown diamonds arriving already set in finished jewelry enter under heading 7113 and are not included, so total lab-grown inflow is larger than this line. Census is the primary series; UN Comtrade is the cross-check. The step down in September 2025 coincides with tariff changes; causation is not asserted.