Contact the American Board of Certified Gemologists with any questions you may have about the diamond buying, appraisal and certification process. Whether you want to know what a diamond certificate is, or you doubt the reputability of the seller you are considering, no question is too great or small. Ask about the methods that ABCG uses for grading and what constitutes a quality diamond or gemstone. Be rest assured that all of your questions are kept confidential and that our only interest is making sure that you, the customer, make the most confident and well-informed diamond, gemstone or jewelry purchase possible.
American Board of Certified Gemologists
62 West 47th Street
New York, NY 10036