Four Treasures Reference Database
Record No. 5562
Dangerous curves: Verneuil synthetic corundum
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Hughes, R.W. and Koivula, J.I. (2005) Dangerous curves: Verneuil synthetic corundum. Lotus Gemology, <https://www.lotusgemology.com/resources/articles/273-verneuil-synthetic-corundum-id-dangerous-curves-lotus-gemology>
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corundum, synthetic corundum.7, gems
Virtually all gemologists are aware of the curved growth lines and gas bubbles in Verneuil (flame-fusion) synthetic corundum, but few understand exactly why they occur and how they are distributed in these stones. This article clarifies these important identifying features.