Abstract
This research aimed to investigate the effects of heat treatment on color and clarity of green sapphires. The Green sapphires were heated at sequentially increasing temperature of 1300, 1400, 1500 and 1600°C in oxygen atmosphere. At each treatment temperatures, the samples were treated for 40hours with their color and clarity were measured before and after heat treatment at each temperature. It was found that, when green sapphires were heated at high temperatures, the color of the untreated sapphire crystal changed to yellow at higher temperatures. Whereas, there were no significant changes in the clarity of all samples found in the temperature range of 1300-1600°C.
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