Four Treasures Reference Database
Record No. 2328
Technique for detection of heat treatment in Sri Lankan yellow and orange sapphires
Journal Article
Hughes, R.W. (1987) Technique for detection of heat treatment in Sri Lankan yellow and orange sapphires. ICA Laboratory Alert, No. 1, 1 p..
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corundum, yellow/orange sapphire, Sri Lanka, heat treatments.6, gems
This article describes how gently heating heat-treated yellow sapphires under a lamp will cause their color to temporarily darken. It can thus be used to separate heated yellow sapphires from natural yellow sapphires.