Gemstones and Metal Clay is a reference guide book for your Metal Clay workshop. Inside, this book details 107 unique natural gemstones and dozens more varieties of each. The final verdicts on the ability to sinter in place using metal clay are outlined for each gem in this book, plus identifying characteristics, possible enhancements, cleaning methods, misnomers, and stability to light and chemicals for each gem as well.This book also contains a glossary of common gemological terms. This book is an invaluable guide written by the first major American pioneer in the field of gemology as applied to metal clay, and is the culmination of over 3 years of hands on experimentation, research, and many wasted gems. Deric Metzger GJG AJA AJP. PMC Guild Certified Instructor, Member Jewelers Vigilance Committee.