Gem and Ornamental Materials of Organic Origin is a unique source of information on this neglected topic of gemology. Presented in full color, with over 200 stunning photographs for ease of reference and identification, the book allows material to be recognized by sight, avoiding the usual gemological tests, which can ruin them. A comprehensive list of materials is included and each is presented with details or its origin, availability and conservation status. Examples of the uses of each material are given, along with a brief history of their use. Maggie Campbell Pederson Hardback 268 pages