CHAPTER 4 GEMSTONE TREATMENT,Chen Binghui Department of Earth Sciences Sun Yat-sen University,GEMOLOGY,Improvement: HeatingTreatment: Dyeing, Irradiation, etc,Definition,Treatment:,the process of artificially altering and improving the appearance and properties of gem material.,Heat treatment Surface diffusion Irradiation (+ Heat treatment ) Laser treatment Impregnation and filling: Oiling, Waxing, Resin and Polymer fillers Coating, painting, foiling and dyeing Chemical Bleaching,Methods of Treatment,
