Identification Characteristics of HPHT Synthetic Diamonds in Jewelry with Cluster Setting
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摘要: 国家黄金钻石制品质量监督检验中心收到待检的百余件群镶钻石首饰中发现混有大量HPHT合成黄色钻石。采用宝石显微镜、红外光谱仪、X射线荧光光谱仪、紫外－可见光分光光谱仪、紫外荧光灯、DiamondViewTM等对HPHT合成钻石样品做了详细地测试与分析。结果表明，这些HPHT合成钻石样品具有较为统一的黄色，放大检查可见合成钻石内部含有大量棒状、柱状、细小微粒状的铁镍合金包裹体，且几乎都有磁性，有些磁性甚至较强；样品的红外反射光谱非常特征，均具有明显的1 131cm－1处的吸收峰，为Ib型钻石，而Ib型钻石在天然钻石中极少见到；X射线荧光光谱测试显示有强烈的铁峰和镍峰，且在短波紫外线下多数具有绿黄色荧光。HPHT合成钻石在DiamondViewTM下具有不同程度的黄绿色荧光，部分具有黑十字现象。
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关键词:
- HPHT合成钻石 /
- 红外光谱 /
- X射线荧光光谱 /
- 显微镜 /
- DiamondViewTM
Abstract: A lot of yellow HPHT synthetic diamonds were found in hundreds pieces of cluster set diamond jewelry, which were received by National Gold & Diamond Testing Center. The HPHT synthetic diamonds were tested systematically by using gem microscope, infrared spectrometer,X-ray fluorescence spectrometer, ultraviolet-visible spectrophotometer, ultraviolet fluorescent lamp and DiamondViewTM, The results show that the colour of HPHT synthetic diamonds is relatively consistent yellow with a large number of rod-like, columnar,fine particulate iron-nickel alloy inclusions. Almost all of these synthetic diamonds are magnetic, even strong magnetic. HPHT synthetic diamonds have an apparent infrared absorption peak at 1 131 cm-1. It indicates these diamonds belong to type Ib diamond which are not common in natural diamonds. Strong peaks of iron and nickel could be tested by X-ray fluorescence. HPHT synthetic diamonds almost exhibit yellow-green fluorescence under shortwave UV fluorescence HPHT synthetic diamonds display yellow-green fluorescence in varying degrees under the DiamondViewTM, and individual shows a black cross phenomenon. -
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