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THAILAND : Sapphire, black -star sapphire, ruby, tourmaline, garnet, beryl and spinel.

Gem mining is currently lowbut Thailand has transformed itself into the world's major manufacturing and production centre for rubies and sapphires. About 70 per cent of the world's sapphire output and 90 per cent of its ruby production pass through Thailand at some stage on their way from the mines to the final customer. along with Sri Lanka, Thailand provides the bet heat treatment technology available for ruby and sapphire.