Four Treasures Reference Database
Record No. 5397
Spectroscopic evidence of heat treatment of blue sapphires from Sri Lanka—additional data

Spectroscopic evidence of heat treatment of blue sapphires from Sri Lanka—additional data

Journal Article
Schmetzer, K. and Kiefert, L. (1990) Spectroscopic evidence of heat treatment of blue sapphires from Sri Lanka—additional data. Journal of Gemmology, Vol. 22, No. 2, April, pp. 80–82.
ISBN/ISSN: 221252  |  Sinkankas/Born No.: NIS / NIB  |  RWHL
corundum, treatments.6, Sri Lanka.12, gems
Differences in the absorption spectra of particular types of natural blue untreated and heat-treated sapphires are due to the presence or absence of Fe³⁺ absorption bands of distinct intensities. These features, identified by spectroscopic investigations, are useful for the recognition of artificial heat treatment in samples of the trade.
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