Key Takeaways: The FTC’s Jewelry Guides require marketers to make clear and conspicuous disclosures to truthfully represent the origin of lab-grown diamonds and gemstones (i.e., distinguishing mined diamonds and gemstones from man-made substitutes) and otherwise comply with the Jewelry Guides (see below for additional compliance considerations). Advertising claims for lab-grown diamonds and gemstones are subject to scrutiny by regulators, competitors (including adverse trade associations), and consumers, so companies should consult with legal counsel when developing…