In July 2018, the U.S. Federal Trade Commission approved a substantial revision to its Jewelry Guides, with changes that impose new rules on how the trade can describe diamonds and diamond simulants.
2018年7月，美國聯邦貿易委員會在其寶石指南做出重大修訂，對天然鑽石和合成鑽石的商業行為制定新規則。