Four Treasures Reference Database
Record No. 2323
Identifying heat-treated Sri Lankan yellow sapphires
Journal Article
Hughes, R.W. (1987) Identifying heat-treated Sri Lankan yellow sapphires. ICA Laboratory Alert, No. 1, 2 pp..
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heat treatments.6, corundum, yellow sapphire, 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.