The U.S. Federal Trade Commission, which investigates allegations of deceptive advertising, has sent warning letters to eight companies to insist they distinguish in advertisements between diamonds from mines and those made in laboratories, it said on Tuesday.
The FTC said it had found instances where the eight companies advertised diamond jewelry “without clearly and conspicuously disclosing that the diamonds are laboratory-created,” according to the letter.
The agency declined to identify the recipients of the letters. An unredacted version of one of the letters seen by Reuters identified that recipient as Diamond Foundry, a California company that makes laboratory diamonds.
Read more about the warning letters sent by the FTC on the Reuters website HERE