Antoinette Matlins, PG, FGA, is the most widely read author in the world on the subject of jewelry and gems Jewelry & Gems: The Buying Guide alone has over 400,000 copies in print). Her books are published in seven languages and are widely used throughout the world by consumers and professionals in the gem and jewelry fields. An internationally respected gem and jewelry expert and a popular media guest, she is frequently quoted as an expert source in print media and is seen on ABC, CBS, NBC and CNN, educating the public about gems and jewelry and exposing fraud. In addition, Matlins is active in the gem trade. Her books include: Jewelry & Gems: The Buying Guide; The Pearl Book: The Definitive Buying Guide; Colored Gemstones: The Antoinette Matlins Buying Guide; Diamonds: The Antoinette Matlins Buying Guide; Engagement & Wedding Rings: The Definitive Buying Guide for People in Love; and Jewelry & Gems at Auction: The Definitive Guide to Buying & Selling at the Auction House & on Internet Auction Sites (all GemStone Press).
Antonio C. Bonanno, FGA, ASA, MGA, was founder and president of the National Gem Appraising Laboratory and director of the Columbia School of Gemology near Washington, D.C. He held the coveted Master Gemologist Appraiser title (MGA), the highest distinction awarded to gem and jewelry appraisers from the American Society of Appraisers. He worked with gems and minerals for over sixty years, specializing in forensic gemology, and was frequently called as an expert witness in a wide range of court cases. A Fellow of the Gemmological Association of Great Britain with Distinction, he was highly esteemed in the field and holds a place in the prestigious Gemstone Hall of Fame. He founded the Accredited Gemologists Association, which created the Antonio C. Bonanno Award for Excellence in Gemology in his honor after his death in 1996.