Provides a complete coverage to the tremendous range of treatments available to enhance the colour and appearance of gemstones. This includes various types of irradiation and heat treatments, colourless impregnations, bleaching, dyeing, diffusion and other processes. Some of these processes date back at least 2000 years, others are of quite recent origin. This edition includes advances such as glass and plastic filling of diamonds and other gemstones, the large expansion in the use of both heat and irradiation treatments and the efforts to keep up identification procedures with the advances in treatments.
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