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6CCVD Research

Identification of Pink-Coloured CVD Synthetic Diamonds from Huzhou Sino-C Semiconductor Co. in China

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2021-07-27
JournalCrystals
AuthorsZhonghua Song, Huiru Dai, Bo Gao, Wenfang Zhu
Citations1
AnalysisFull AI Review Included

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In recent years, increasing numbers of pink-coloured CVD synthetic diamonds have appeared on the market. One of the major sources is Huzhou SinoC Semiconductor Science and Technology Co., Ltd., Zhejiang province of China. In this article, seven pink-coloured CVD-grown diamonds produced in the last two years by Huzhou have been investigated and identified, including their gemological and spectroscopic characteristics. In DiamondView, they fluoresced orange-red, with an obscure striated growth structure, which is common for CVD synthetics. The mid-IR absorption spectra of these samples showed some single nitrogen and hydrogen-related features (1130, 1344, 3123, 3323 cmāˆ’1), which indicated that the diamonds were type Ib and were CVD-grown diamonds. The H1a defect annealed out at approximately 1400 Ā°C, whereas the 3107 cmāˆ’1 defect was produced by annealing above 1700 or 1800 Ā°C. This implied that the samples had undergone two separate heat treatments: first, a high-temperature anneal (possibly an HPHT treatment to reduce any brown colour), which would have produced the 3107 cmāˆ’1 defects and a small number of A centres, followed by irradiation, followed by annealing above 800 Ā°C to make the vacancies mobile. The UV-Vis-NIR absorption spectra showed distinct NV-related features (575 and 637 nm), the main reason for the pink colour. Photoluminescence spectra obtained at liquid nitrogen temperature recorded radiation-related emissions (388.9, 503.5 nm), a strong N-V centre, H3 and H2 defects, and many unassigned emissions. These pink CVD products can be separated from natural and treated pink-coloured diamonds by a combination of optical spectroscopic properties, such as fluorescence colour, and absorption features in the infrared and UV-Vis regions.

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References

Section titled ā€œReferencesā€
  1. 2007 - Latest-generation CVD-grown synthetic diamonds from Apollo Diamond Inc [Crossref]
  2. 2018 - Speaker Presentations: LPHT-Treated Pink CVD Synthetic Diamond
  3. 2009 - Pink CVD synthetic diamond
  4. 2010 - Strongly colored pink CVD lab-grown diamonds [Crossref]
  5. 2015 - Lab Notes: LPHT pink CVD synthetic diamonds
  6. 2016 - Observations on CVD-grown synthetic diamonds: A review
  7. 2012 - The identification features of undisclosed loose and mounted CVD synthetic diamonds which have appeared recently in the NGTC laboratory [Crossref]
  8. 2020 - Identification of IIa blue CVD synthetic diamonds from HUzhou SinoC Semiconductor Co. in China [Crossref]
  9. 2019 - Current status of Chinese synthetic diamonds [Crossref]
  10. 2004 - Identification of synthetic diamond grown using chemical vapor deposition (CVD) [Crossref]

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