A plan to build a synthetic diamond plant in the United States may be part of Japan's $550 billion investment package, amid a push to expand production of the material vital to chip and high-precision manufacturing. https://www.japantimes.co.jp/business/2026/01/27/economy/us-japan-synthetic-diamond-production/?utm_medium=Social&utm_source=mastodon #business #economy #usjapanrelations #donaldtrump #tariffs