Abstract
Department of Earth Environmental Science, Pukyong National UniversityRuby is one of the most favor colored gem, for beautiful red tone, be high in scarcity value. However, rubieswith high quality are produced in restricted regions, such as in Thailand, Sri Lanka, Myanmar, and Tanzania etc.,and they have been gradually exhausted by mining for a long period. Therefore, improving qualities of low levelrubies with various treatments is arising an alternative way to obtain better rubies. Gemological and mineralogicalproperties of the natural ruby from Tanzanian were studied with heat treatments. Those characteristics were com-pared between only heat and adding flux materials under heating. Tanzanian raw rubies were applied a heat treat-ment (1,600°C for 6 hours). However, chromameter and UV-Vis analyses found that a simple heat treatment isinappropriated for the Tanzanian ruby. Although Cr
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