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Reply To: Blue sapphire

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Dear sir
Heating this blue Sapphire in reducing environment would increase the colour of the gem. Heating in air would reduce the colour so please make sure that the stone is heated in reducing environment only. Further the rate of heating , rate of cooling, the maximum temperature reached and the halt at the maximum temperature play major role on both color and / clarity. Expert hands are needed for the experiment or else the gem gets spoiled. Please read Heat treatment of rubies and sapphires by Kurt Nassau and also heat treatment of Rubies and sapphires by Ted Themelis

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