The Bureau of Consumer Protection of the of the U.S. Federal Trade Commission (FTC) presents the full text of the December 2001 business fact sheet entitled "In the Loupe: Advertising Diamonds, Gemstones, and Pearls." The text is available in PDF format. The fact sheet offers tips for businesses on how to describe jewelry products, including diamonds, gemstones, and pearls. The bureau discusses fractional representations of weight, gemstone treatments, thermal testers, and disclosures in advertising.