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| One Faceted Brown Diamond With Octahedral Diamond and Symmetrical Clouds Inclusion |
| LIU Xin-wei1, 2, WU De-hai2, 3*, WU Gai4*, WANG Chun-jie5 |
1. Gemmological Institute, China University of Geosciences (Wuhan), Wuhan 430074, China
2. School of Resources, Environment and Jewelry, Jiangxi College of Applied Technology, Ganzhou 341000, China
3. Key Laboratory of Ionic Rare Earth Resources and Environment, Ministry of Natural Resources, Ganzhou 341000, China
4. Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
5. Baogu Technology (Shenzhen) Co., Ltd., Shenzhen 518000, China
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Abstract Diamond inclusions retain a lot of information when the diamond is formed. Different types of inclusions correspond to different growth environments. There are few studies about diamond inclusion in diamonds, and researchers have heatedly discussed its forming mechanism. However, the study on diamond inclusions usually requires destructive sample preparation, and this research method is unsuitable for faceted diamond research. This paper used Micro-Raman spectroscopy mapping technology to receive high-resolution Raman mapping images. They use infrared, photoluminescence, and three-dimensional fluorescence spectroscopy to study non-destructively on a faceted diamond sample with diamond inclusion and symmetrical cloud inclusions this brown sample with a green hue. The table shows the dark brown ribbon around the pavilion and the inclusion of symmetrical radiate clouds. A crystal can be seen in the middle with the naked eye, and microscopic characteristics show its octahedral habit. Obvious green fluorescence can be seen under longwave ultraviolet. According to the infrared spectrum, these diamond types and dark brown radiate clouds are related to hydrogen-rich. Its brown body color is related to non-deformation-related defects and deformation-related defects. The low-temperature photoluminescence spectrum shows that this sample has an H4 center, and it is inferred that the diamond may undergo radiated irradiation and high-temperature annealing. Peaks at 545 and 563 nm of PL are related to hydrogen defects, peak at 637 nm (ZPL of NV-center), and peak at 741 nm GR1 defects, which caused the green hue of diamond. This implies that this diamond has been naturally irradiated and has not experienced high temperatures during residence. Three-dimensional fluorescence spectroscopy verifies that the sample emitted strong green fluorescence under LWUV, related to the broadened peak at λem 520 nm. The optimal excitation wavelength is located at λex 420 nm. The fluorescence center is related to H3, verifying that the diamond has undergone irradiation and annealing. Raman spectroscopy confirmed the octahedral crystal inclusion in the sample as a diamond. According to Raman mapping results, the frequency of Raman peaks at the rim of inclusion shows quite a difference, so there is a certain stress in the diamond inclusion. The maximum residual stress is estimated to be about 0.49 GPa. The crystallization rate is faster than that in the edge. Changing temperature and pressure conditions during crystallization may generate residual stress between the inclusion and the host. In addition, there are many impurities in diamonds, which can also cause certain lattice distortion.
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Received: 2023-10-16
Accepted: 2024-02-02
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Corresponding Authors:
WU De-hai
E-mail: wudehai@jxyy.edu.cn；wugai1988@whu.edu.cn
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