European Journal of Mineralogy
European Journal of Mineralogy
European Journal of Mineralogy
Articles | Volume 38, issue 2
Articles | Volume 38, issue 2
https://doi.org/10.5194/ejm-38-123-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
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https://doi.org/10.5194/ejm-38-123-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 38, issue 2
Research article
 | 
18 Mar 2026
Research article |  | 18 Mar 2026

High-spatial-resolution oxygen isotopic analysis to distinguish natural from synthetic corundum

Elena S. Sorokina, Axel K. Schmitt, Tobias Häger, and Jens Hopp

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Short summary
Natural ruby and sapphire are of the rarest gemstones. To further enable their identification from synthetic analogues, this study explores secondary ionization mass spectrometry (SIMS) oxygen isotope analysis. SIMS δ18O analysis of hydrothermal corundum yielded values between -7.84 ± 0.13 ‰ and -14.54 ± 0.13 ‰ (Vienna Standard Mean Ocean Water), which are atypical for natural corundum. SIMS δ18O analysis of corundum thus has strong potential to distinguish synthetic and natural corundum.
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Experimental mineralogy, petrology, and geochemistry