Fig. 20b A first Tanzania ruby that was heat-treated in a laboratory in Chantaburi did not show theses lines. Heat-treatment may be applied for the purpose of removing blue zones in rubies. A further more detailed report on heat-treatment of the Dodoma rubies will be included at a later stage. It is expected that the FTIR test will be a very important test for separating heated from unheated rubies.
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