Open Access Article
This Open Access Article is licensed under a Creative Commons Attribution 3.0 Unported Licence
Expression of concern: Preparation of “natural” diamonds by HPHT annealing of synthetic diamonds
Chao Fang
a,
Yuewen Zhanga,
Zhuangfei Zhanga,
Chongxin Shan*a,
Weixia Shena and
Xiaopeng Jia*ab
aSchool of Physical Engineering, Zhengzhou University, Zhengzhou 450052, China. E-mail: cxshan@zzu.edu.cn; xpjia@zzu.edu.cn; Fax: +86 371 67763923; Tel: +86 371 67763923
bState Key Lab of Superhard Materials, Jilin University, Changchun 130012, China
First published on 4th August 2025
Abstract
Expression of concern for ‘Preparation of “natural” diamonds by HPHT annealing of synthetic diamonds’ by Xiaopeng Jia et al., CrystEngComm, 2018, 20, 505–511, https://doi.org/10.1039/C7CE02013A.
CrystEngComm is publishing this expression of concern in order to alert its readers that concerns have been raised regarding the hydrogen-related peaks observed in the IR spectra.
It has been suggested that these peaks could be due to impurities such as grease on the surface of the crystals and subsequent work by the authors has indicated that this could be the case. The authors have been asked to carry out further experimental work to confirm the conclusions of their paper, and an expression of concern will continue to be associated with this article until a final outcome is reached.
Signed: Sally Howells-Wyllie, Executive Editor, CrystEngComm
Date: 30th July 2025
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