内容简介：
This is the most practical and informative reference book for the jewellery trade. It provides all the information on necessary areas of product knowledge required by the professional jeweller. It is also an invaluable text for all students studying for NAG JET and NAG Gemmology courses, and the new summary and learning section will greatly improve the textbook elements of this new edition. This new edition also includes an entirely new chapter on the appraisal of jewellery and one on gemmological instruments. The current material in the book will also be updated throughout, bringing it in line with the new NAG courses. Demand is growing for appraising jewellery for insurance, hence the addition of this new chapter and the addition of the gemmological instruments chapter will increase the market to include yet more gemmologists rather than solely jewellers. Pawnbrokers will also be interested in this new text, as well as the secondhand sectors of the jewellery manufacturing trade. It offers: updated information on Diamond Grading; hallmarking information updated in line with the 1999 changes; and additional summary and learning exercises.