Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds

Shi TANG; Jun SU; Tai-jin LU; Yong-wang MA; Jie KE; Zhong-hua SONG; Jun ZHANG; Xiao-yu ZHANG; Hui-ru DAI; Hai-bo LI; Jian ZHANG; Xu-xu WU; Hou-xiang LIU

doi:10.15898/j.cnki.11-2131/td.201802070017

2019 Vol. 38, No. 1

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Article navigation > Rock and Mineral Analysis > 2019 > 38(1): 62-70

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Shi TANG, Jun SU, Tai-jin LU, Yong-wang MA, Jie KE, Zhong-hua SONG, Jun ZHANG, Xiao-yu ZHANG, Hui-ru DAI, Hai-bo LI, Jian ZHANG, Xu-xu WU, Hou-xiang LIU. Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds[J]. Rock and Mineral Analysis, 2019, 38(1): 62-70. doi: 10.15898/j.cnki.11-2131/td.201802070017

Citation:

Shi TANG, Jun SU, Tai-jin LU, Yong-wang MA, Jie KE, Zhong-hua SONG, Jun ZHANG, Xiao-yu ZHANG, Hui-ru DAI, Hai-bo LI, Jian ZHANG, Xu-xu WU, Hou-xiang LIU. Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds[J]. Rock and Mineral Analysis, 2019, 38(1): 62-70. doi: 10.15898/j.cnki.11-2131/td.201802070017

Research on Laboratory Testing Features of Chemical Vapor Deposition in Overgrowth Diamonds

1.
National Gemstone Testing Center, Beijing 100013, China
2.
Research Institute of Beijing, National Gems & Jewelry Technology Administrative Center, Ministry of Natural Resources, Beijing 100013, China
3.
National Gemstone Testing Center, Shenyang 110013, China
4.
National Gemstone Testing Center, Shanghai 200122, China

More Information

Corresponding author: Jun SU, suj@ngtc.com.cn

Received Date: 07 February 2018

Revised Date: 25 April 2018

Accepted Date: 10 August 2018

Abstract

Abstract

BACKGROUNDOvergrowth diamond refers to the product of thick CVD synthetic diamond layer grown on a natural diamond with the whole appearance. Since overgrown diamonds contain information on the nitrogen impurities of natural diamonds, traditional synthetic diamond screening methods and testing procedures are no longer applicable to the detection of overgrown diamonds. OBJECTIVETo gemologically test an overgrowth diamond sample in order to investigate the full identification features and to propose the optimum detection strategy. METHODSMinspecting, screening instruments testing, UV-Vis/FTIR/PL spectra examinations, as well as fluorescence and phosphorescence observation under deep UV excitation are carried out. RESULTSThe sample cannot be identified by traditional microscopic observation, diamond instrument screening, and infrared spectra measurement. The sample has a distinct boundary that is separated by different luminescence under DiamondView^TM. The upper layer displays red fluorescence and greenish blue phosphorescence, while the lower layer shows deep blue fluorescence and no phosphorescence. Infrared spectroscopic analysis shows that the upper layer is type Ⅱa and the lower layer is type Ⅰa diamond. The UV-Vis absorption and photoluminescence spectra confirmed the coexistence of N3 centers and a high level of[Si-V]^- defects in the diamond. CONCLUSIONSIt was confirmed that the lower part of the sample is natural and the upper part of the sample is CVD synthetic layer with a thickness around 740μm. The first overgrowth diamond reported domestically was compared to the same type of samples reported abroad. The existence of a boundary are missing and the thickness of the CVD layer increased significantly in this sample. The innovative application of the multidirectional luminescence imaging and spectroscopic analyses is the key to laboratory testing of overgrowth diamond.
- overgrowth diamond /
- CVD synthetic diamond /
- spectroscopic testing /
- luminescence imaging

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References

[1]	Fritsch E, Phelps A W.Type Ⅱb diamond thin films deposited on tonear-colorless naturalgem diamonds[J].Diamond & Related Materials, 1993, 2(2-4):70-74. Google Scholar
[2]	Yacobi B G, Lebens J, Vahala K J, et al.Preferential incorporation of defects in monocrystalline diamond films[J].Diamond & Related Materials, 1993, 2(2-4):92-99. Google Scholar
[3]	Eaton-Magana S.Long-term durability of CVD synthetic film on natural diamond[J].Gems & Gemology, 2014, 50(2):152. Google Scholar
[4]	Moe K J, Johnson P, D'Haenens-Johansson U, et al.A synthetic diamond overgrowth on a natural diamond[J].Gems & Gemology, 2017, 53(2):237-239. Google Scholar
[5]	Serov R, Shelementiev Y, Serova A.Hybrid Diamonds: Natural Diamonds Overgrown with CVD Synthetic[C]//The Proceedings of 35th International Geological Congress.2017: 51-53. Google Scholar
[6]	Christopher M, Breeding, Shigley J E.The 'type' classi-fication system of diamonds and its importance in gemology[J].Gems & Gemology, 2009, 45(2):96-111. Google Scholar
[7]	宋中华, 陆太进, 苏隽, 等.无色-近无色高温高压合成钻石的谱图特征及其鉴别方法[J].岩矿测试, 2016, 35(5):496-504. Google Scholar Song Z H, Lu T J, Su J, et al.The spectral characteristics and identification techniques forcolorless and nearcolorless HPHT synthetic diamonds[J].Rock and Mineral Analysis, 2016, 35(5):496-504. Google Scholar
[8]	Wang W, Johnson P, Moe K S, et al.CVD synthetic diamonds from gemesis corp[J].Gems & Gemology, 2012, 48(2):80-97. Google Scholar
[9]	Moses T M, Reinitz I M, Johnson M L, et al.A contri-bution to understanding the effect of blue fluorescence on the appearance of diamonds[J].Gems & Gemology, 1997, 33(4):244-259. Google Scholar
[10]	Shigley J E, Breeding C M.Optical defects in diamond:A quick reference chart[J].Gems & Gemology, 2013, 49(2):107-111. Google Scholar
[11]	Tang S, Su J, Lu T J, et al.A melee-size CVD synthetic diamond in pearl and diamond jewelry[J].Gems & Gemology, 2017, 53(3):382. Google Scholar
[12]	Wang W, Moses T, Linares R, et al.Gem-quality synthe-tic diamonds grown by the chemical vapor deposition method[J].Gems & Gemology, 2003, 39(4):268-283. Google Scholar
[13]	Eaton-Magana S, Shigley J E.Observations on CVD-grown synthetic diamonds:A review[J].Gems & Gemology, 2016, 52(3):222. Google Scholar
[14]	宋中华, 兰延, 沈美冬, 等.NGTC实验室发现未揭示的CVD合成钻石鉴定特征研究[J].宝石和宝石学杂志, 2012, 14(4):30-34. doi: 10.3969/j.issn.1008-214X.2012.04.005 CrossRef Google Scholar Song Z H, Lan Y, Shen M D, et al.Identification characteristics of undisclosed CVD synthetic diamonds found recently by NGTC[J].Journal of Gems and Gemmology, 2012, 14(4):30-34. doi: 10.3969/j.issn.1008-214X.2012.04.005 CrossRef Google Scholar
[15]	Collins A T.Colour centers in diamond[J].Journal of Gemmology, 1982, 18:35-75. Google Scholar
[16]	Collins A T.The colour of diamond and how it may be changed[J].Journal of Gemmology, 2001, 27:341-359. doi: 10.15506/JoG.2001.27.6 CrossRef Google Scholar
[17]	Collins A T, Stanley M, Woods G S.Nitrogen isotope effects in synthetic diamonds[J].Journal of Physics D:Applied Physics, 1987, 20(7):969-974. doi: 10.1088/0022-3727/20/7/022 CrossRef Google Scholar
[18]	Collins A T.Intrinsic and extrinsic absorption and luminescence in diamond[J].Physica B:Condensed Matter, 1993, 185(1-4):284-296. doi: 10.1016/0921-4526(93)90250-A CrossRef Google Scholar
[19]	Collins A T, Kanda H, Burns R C.The segregation of nickel-related optical centers in the octahedral growth sectors of synthetic diamond[J].Philosophical Magazine B, 1990, 61(5):797-810. doi: 10.1080/13642819008207562 CrossRef Google Scholar
[20]	Tang S, Song Z H, Lu T J, et al.Two natural type Ⅱa diamonds with strong phosphorescence and Ni-related defects[J].Gems & Gemology, 2017, 53(4):476-478. Google Scholar
[21]	Song Z H, Lan Y, Shen M D, et al.Identification characteristics of undisclosed CVD synthetic diamonds found recently by NGTC[J].Journal of Gems and Gemmology, 2012, 14(4):30-34. Google Scholar
[22]	宋中华, 魏华, 田晶.钻石辨假[M].北京:文化出版社, 2017. Google Scholar Song Z H, Wei H, Tian J.Identification of Diamonds[M].Beijing:Cultural Development Press, 2017. Google Scholar
[23]	Fisher D, Spits R A.Spectroscopic evidence of GE POL HPHT-treated natural type Ⅱa diamonds[J].Gems & Gemology, 2000, 36(1):42-49. Google Scholar
[24]	宋中华, 陆太进, 苏隽, 等.利用吸收和发光光谱技术分析高温高压天然富氢钻石的鉴定特征[J].岩矿测试, 2018, 37(1):64-68. Google Scholar Song Z H, Lu T J, Su J, et al. Identification of HPHT-treated hydrogen-rich diamonds by optical absorption and photo luminescence spectroscopy techniques[J].Rock and Mineral Analysis, 2018, 37(1):64-69. Google Scholar