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http://dx.doi.org/10.4191/kcers.2014.51.4.350

Properties of the Natural and CVD Synthetic Diamonds for Identification  

Kim, Yunwoo (Department of Materials Science and Engineering, University of Seoul)
Song, Jeongho (Department of Materials Science and Engineering, University of Seoul)
Noh, Yunyoung (Department of Materials Science and Engineering, University of Seoul)
Song, Ohsung (Department of Materials Science and Engineering, University of Seoul)
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Abstract
Recently, Chemical Vapor Deposition (CVD) synthetic diamonds have been introduced to the jewelry gem market, as CVD technology has been making considerable advances. Unfortunately, CVD diamonds are not distinguishable from natural diamonds when using the conventional gemological characterization method. Therefore, we need to develop a new identification method that is non-destructive, fast, and inexpensive. In our study, we employed optical microscopy and spectroscopy techniques, including Fourier transform infra-red (FT-IR), UV-VIS-NIR, photoluminescence (PL), micro Raman, and cathodoluminescent (CL) spectroscopy, to determine the differences between a natural diamond (0.30 cts) and a CVD diamond (0.43 cts). The identification of a CVD diamond was difficult when using standard gemological techniques, UV-VIS-NIR, or micro-Raman spectroscopy. However, a CVD diamond could be identified using a FT-IR by the Type II peaks. In addition, we identified a CVD diamond conclusively with the uneven UV fluorescent local bands, additional satellite PL peaks, longer phosphorescence life time, and uneven streaks in the CL images. Our results suggest that using FT-IR combined with UV fluorescent images, PL, and CL analysis might be an appropriate method for identifying CVD diamonds.
Keywords
CVD diamond; FT-IR; Photoluminescence; Phosphorescence life time; Cathodoluminescence;
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  • Reference
1 A. T. Collins, H. Kanda, and H. Hiatawaki, "Colour Changes Produced in Natural Brown Diamonds by High-pressure High-temperature Treatment," Diamond Relat. Mater., 9 113-22 (2000).   DOI   ScienceOn
2 B. Willems, A. Tallaire, and J. Barjon, "Exploring the Origin and Nature of Luminescent Regions in CVD Synthetic Diamond," Gems Gemol., 47 [3] 202-07 (2011).   DOI
3 W. Wang, M. S. Hall, K. S. Moe, J. Tower, and T. M. Moses, "Latest-generation CVD-grown Synthetic Diamonds from Apollo Diamond Inc.," Gems Gemol., 43 [4] 294-312 (2007).   DOI
4 C. M. Breeding and J. E. Shigley, "The 'Type' Classification System of Diamonds and Its Importance in Gemology," Gems Gemol., 45 [2] 96-111 (2009).   DOI
5 W. Wang, U. F. S. D'haenens-Johansson, P. Johnson, K. S. Moe, E. Emerson, M. E. Newton, and T. M. Moses "CVD Synthetic Diamonds From Gemesis Corp.," Gems Gemol., 48 [2] 80-97 (2012).   DOI
6 lement Six Ltd., "A Method of Incorporating a Mark in the Chemical Vapor Deposition Diamond (in UK)," UK. Patent, 10-2006-7012804, 2006.
7 J. E. Shigley, R. Abbaschian, and C. Clarke "Gemesis Laboratory-created Diamond," Gems Gemol., 38 [4] 301-09 (2002).   DOI
8 M. Z. Othman, P. W. May, N. A. Fox, and P. J. Heard, "Incorporation of Lithium and Nitrogen into CVD Diamond Thin Films," Diamond Relat. Mater., 44 1-7 (2014).   DOI
9 E. Rohrer, C. E. Nebel, M. Stutzmann, A. Floter, R. Zachai, X. Jiang, and C. P. Klages, "Photoconductivity of Undoped, Nitrogen-and Boron Doped CVD-and Synthetic Diamond," Diamond Relat. Mater., 7 879-83 (1998).   DOI
10 R. M. Hazen, The Diamond Makers; Vol. 1, pp.104-52, Cambridge University Press, UK, 1999.
11 D. Fisher and R. A. Spits, "Spectroscopic Evidence of GE POL HPHT-treated Natural Type IIa Diamonds," Gems Gemol., 36 [1] 42-49 (2000).   DOI
12 O. S. Song, "Characterization of Synthesized and Treated Gem Diamonds," Met. Mater. Int., 13 [5] 427-31 (2007).   DOI
13 W. Wang, T. Moses, R. C. Linares, J. E. Shiglet, M. Hall, and J. E. Butler, "Gem-quality Synthetic Diamonds Grown by a Chemical Vapor Deposition (CVD) Method," Gems Gemol., 39 [4] 268-83 (2003).   DOI
14 P. M. Martineau, S. C. Lawson, A. J. Taylor, S. J. Quinn, D. J. F. Evans, and M. J. Crowder, "Identification of Synthetic Diamond Grown Using Chemical Vapor Deposition (CVD)," Gems Gemol., 40 [1] 2-25 (2004).   DOI