Abstract
This research aims to investigate the effects of bismuth glass filling treatment on physical properties of natural ruby. The ruby mixed with bismuth glass powder was treated in electric furnace at 1000, 1100, 1200 and 1300°C in oxygen atmosphere for 24 hours, respectively. Each ruby before heated and after heated was determined reflective index and specific gravity. Fissure and inclusion of all samples were observed by optical microscope. The result reveals that reflective index and specific gravity of treated rubies were increased more than before treatment. Moreover, the result shows that the fissure surface on ruby was filled by glass and made clear surface.
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