注胶海蓝宝石的鉴定方法

Identification Method of Glue-Filled Aquamarine

  • 摘要: 随着海蓝宝石越来越受消费者的青睐,市场中开始大量出现经过注胶充填处理的海蓝宝石,其在一定程度上改善了海蓝宝石的耐久性与外观,但是在售卖过程中仍需注明为“处理”。采用常规宝石学测试方法及傅里叶变换红外光谱仪、激光拉曼光谱仪等对注胶海蓝宝石的鉴定方法进行了深入的分析和研究。经充填处理的海蓝宝石,折射率为1.577~1.583,属正常范围,但相对密度偏低(2.55~2.70),显微放大检查常可见表面的充填物残余,裂隙处可见充填物与主体存在明显光泽差异,在裂隙深处还可见注胶气泡及蓝紫色的闪光。紫外荧光灯下,充填物多沿裂隙或凹坑发出明显蓝白色荧光。红外光谱仪显示2 872、2 930、2 962 cm-1处的亚甲基(—CH2—)与甲基(—CH3—)的伸缩振动谱带,3 032、3 058 cm-1处苯环引起的吸收峰及4 065 cm-1处的弱吸收峰。拉曼光谱测试显示充填物主要出现1 113、1 186、1 608 cm-1及2 870、2 924、3 066 cm-1两组拉曼位移,其中2 924 cm-1和2 870 cm-1处为甲基(—CH3—)和亚甲基(—CH2—)的伸缩振动,其余拉曼位移皆为苯环所致。蓝色闪光与紫外荧光均可作为注胶海蓝宝石最直观便捷的检测方式,而红外光谱和拉曼光谱测试技术为鉴定注胶海蓝宝石提供有力的科学依据。

     

    Abstract: As aquamarine becomes more and more popular with consumers, a large number of aquamarines that have been filled with glue began to appear in the market. This treatment improves the durability and appearance of aquamarine to a certain extent, but it still needs to be marked as "treatment" during trade. This article uses conventional gemmological testing methods, Fourier transform infrared spectrometer, and laser Raman spectrometer to analyze and study the identification method of glue-filled aquamarine in depth. The refractive index of the glue-filled aquamarine is 1.577 to 1.583, which is in the normal range, but the relative density is low(2.55-2.70). Microscopic magnification inspection can often see the residue of the filling of the surface, and there is a difference in luster of the crack between the filler and the main body, and the bubbles produces by glue injection and blue-purple flash effect can be seen in the depth of the fracture. Under ultraviolet fluorescent lamps, the filler mostly emits a distinct blue-white fluorescence along the fissure or pit. The infrared spectrometer shows the telescopic vibration band of methylene (—CH2—) and methyl (—CH3—) at 2 872, 2 930, 2 962 cm-1 and methyl (—CH3—) and the absorption peak caused by the benzene ring at 3 032, 3 058 cm-1 and weak absorption peak at 4 065 cm-1. Raman spectra showed that the filler mainly appeared two sets of Raman displacement combination at 1 113, 1 186, 1 608 cm-1 and 2 870, 2 924, 3 066 cm-1, and Raman spectrum peaks at the 2 924 cm-1 and 2 870 cm-1are attributed to the stretching vibration of methyl (—CH3—) and methylene (—CH2—) and the rest of the Raman shift are due to the benzene ring. Both blue flash and ultraviolet fluorescence can be used as the most intuitive and convenient detection methods for glue-filled aquamarine, and infrared spectroscopy and Raman spectroscopy testing technology can provide a strong scientific basis for identifying glue-filled aquamarine.

     

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