'The IGS Diamond Buyer's Guide' contains the most comprehensive study on diamonds that I have found in one book. The information provided is extremely useful and easy to understand. It can be used by the most amateur diamond buyer to get a great diamond for a great price. It's so easy to be misled when buying a diamond. And if people read just one book to understand what their buying, I would highly recommend that this guide be the one.' Barb Marik, Chicago, Illinois April 1, 1999