Lab-grown and natural diamond price index moves by carat and grade, gold, platinum and silver price moves with the effect on a typical ring, retailer sale windows and price changes at Blue Nile, James Allen, Brilliant Earth, Signet, Tiffany and the online labs, grading lab rule changes and fraud alerts, FTC jewelry guide and disclosure changes, insurance and appraisal rule changes, trade-in and upgrade program changes, tariff effects on imported jewelry and recalls and lead findings in fashion jewelry, with the category, retailer or index first and the price of a one-carat example.