Four Treasures Reference Database
Record No. 3756
Carbon dioxide fluid inclusions as proof of natural-colored corundum
Journal Article
Koivula, J.I. (1986) Carbon dioxide fluid inclusions as proof of natural-colored corundum. Gems & Gemology, Vol. 22, No. 3, Fall, pp. 152–155.
ISBN/ISSN: 0016626X | RWHL*
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gems, corundum, treatments.6, inclusions.5, Sri Lanka.12
The question of how to identify natural-colored from heat-treated corundum has long puzzled the gemological community. One important clue is now provided b y carbon dioxide fluid inclusions. Because such inclusions cannot survive heat treatment, their existence intact and unruptured in rubies and sapphires i s conclusive proof that n o heat treatment has occurred.