国内市场小颗粒无色高压高温合成钻石的鉴定特征
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摘要
2015年,国家珠宝玉石质量监督检验中心(NGTC)深圳实验室先后在送检的镶嵌饰品中检测出多批次混杂在配镶副石中的无色小颗粒高压高温(HPHT)合成钻石,本文对这些饰品的特征进行了详细的测试和分析。结果表明,小颗粒高压高温合成钻石样品中可见Fe、Ni等金属包裹体,并大多具有磁性;红外光谱可检测到弱的2 802cm~(-1)跟B相关的吸收峰;钻石观察仪下可见蓝色-蓝绿色荧光的几何状生长分区以及强蓝色磷光;紫外-可见-近红外光谱可检测到与Ni相关吸收线(685,880nm);小颗粒钻石自动排查仪(AMS)测试结果均为"referⅡ型"或"refer"。虽然前人对无色高压高温合成钻石已有少量研究,但在实验室送检样品的配石中属首次发现,这应引起重视和警惕。
Near-colourless melee-sized HPHT synthetic diamonds mounted as side stones in jewelry were submitted to NGTC lab and detected in 2015.Detailed analysis and testing for these jewelries were performed.The results revealed that these synthetic diamond contained Fe,Ni and other metal-bearing inclusions,which could be attracted by a strong magnet.A weak B-related absorption peak at 2 802cm~(-1) was detected in the IR spectra.DiamondViewTM observations showed blue and bluish green fluorescence with geometric shaped growth pattern and strong blue phosphorescence.Ni-related absorption lines(880,685nm)were detected in the UV-Vis-NIR absorption spectra.The testing results of these melee-sized HPHT synthetic diamonds indicated"referⅡ"or"refe"according to a automatic rapid dia-mond verification instrument(AMS).Although there were a few reports on the loose nearcolourless melee-sized HPHT synthetic diamonds,it was the first time that they were found in jewelries as side stones submitted to the gem laboratory.Therefore,special attention and due vigilance should be warranted.
Near-colourless melee-sized HPHT synthetic diamonds mounted as side stones in jewelry were submitted to NGTC lab and detected in 2015.Detailed analysis and testing for these jewelries were performed.The results revealed that these synthetic diamond contained Fe,Ni and other metal-bearing inclusions,which could be attracted by a strong magnet.A weak B-related absorption peak at 2 802cm~(-1) was detected in the IR spectra.DiamondViewTM observations showed blue and bluish green fluorescence with geometric shaped growth pattern and strong blue phosphorescence.Ni-related absorption lines(880,685nm)were detected in the UV-Vis-NIR absorption spectra.The testing results of these melee-sized HPHT synthetic diamonds indicated"referⅡ"or"refe"according to a automatic rapid dia-mond verification instrument(AMS).Although there were a few reports on the loose nearcolourless melee-sized HPHT synthetic diamonds,it was the first time that they were found in jewelries as side stones submitted to the gem laboratory.Therefore,special attention and due vigilance should be warranted.
引文
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[10]D'Haenens-johansson U F S.Moe K S,Johnson P.Nearcolorless HPHT synthetic diamonds from AOTC Group[J].Gems&.Gemology,2014.50(1):2-14.
[11]Wang W Y Hall M.Breeding C M.Natural type la diamond with green-yellow color due to Ni-related defects[J].Gems&Gemology,2007,43(3):240-243.
[2]Koivula J I,Fryer C W.Identifying gem-quality synthetic diamonds:An update[J].Gems&Gemology.1984.20(3):146-158.
[3]Shigley J E.Fritsch E,Stockton C M,et al.The gemological properties of the sumitomo gem-quality synthetic yellow diamonds[J].Gems&.Gemology,1986,22(4):192-208.
[4]Shigley J E,Fritsch E,Reinitz I.Two near-colorless gemeral electric type IIa synthetic diamond crystals[J].Gems&Gemology,1993,29(3):191-197.
[5]Shigley J E,Fritsch E,Koivula J I,et al.The gemological properties of Russian gem-quality synthetic yellow diamonds[J].Gems&Gemology,1993.29(4):228-248.
[6]Moses T M.Reinitz 1.Fritsch E.Shigley J E.Two treatedcolor synthetic red diamonds seen in the trade[J].Gems&.Gemology,1993.29(3):182-190.
[7]Shigley J E,McClure S F.Breeding C M,et al.Lab-grown colored diamonds from chatham created gems[J].Gems&Gemology,2004,40(2):128-145.
[8]Rooney M L T,Wellboum C M,Shigley J E.De Beers near colorless-to-blue experimental gem-quality synthetic diamonds[J].Gems&Gemology,1993,29(1):38-45.
[9]Shigley J E.Moses T M,Reinitz I,et al.Gemological properties of near-colorless synthetic diamonds[J].Gems&Gemology,1997.33(1):42-53.
[10]D'Haenens-johansson U F S.Moe K S,Johnson P.Nearcolorless HPHT synthetic diamonds from AOTC Group[J].Gems&.Gemology,2014.50(1):2-14.
[11]Wang W Y Hall M.Breeding C M.Natural type la diamond with green-yellow color due to Ni-related defects[J].Gems&Gemology,2007,43(3):240-243.