红外光谱在常见优化处理宝石鉴定中的应用

Application of Infrared Spectra to Identification of Enhanced Common Gemstones

选取市场上常见优化处理(充填处理和覆膜处理)宝石进行常规宝石学测试和红外光谱特征研究。研究发现,利用常规宝石学特征无法区分优化处理宝石,但红外光谱特征却可以准确快速地判定。测试结果表明,采用透射法观察2800~3200 cm^(-1)范围内的吸收谱带可以鉴定宝石是否经过有机物充填处理,在充油宝石和浸蜡宝石中可见2850,2928,2966 cm^(-1)附近的吸收谱带,充胶宝石的特征鉴别谱带在3035,3056,3095 cm^(-1)附近,吸收谱带越强充填程度越高。铅玻璃充填宝石的鉴别特征为2235 cm^(-1)和2609 cm^(-1)附近的谱带。红外反射法可以直接鉴定人造树脂材料覆膜处理的宝石。

Some enhanced common gemstones via filling and coating treatments in the market were selected for the regular gemological test and infrared spectral investigation.The research discloses that the enhanced gemstone cannot be distinguished using the regular gemological features,but it can be accurately and quickly identified using the infrared spectral features.The test results show that the absorption bands ranging from 2800 cm^(-1)to 3200 cm^(-1)observed using a transmission method can be used to identify whether the gems have been treated with organic material filling.The absorption bands around 2850,2928,and 2966 cm^(-1)can be seen in oil-soaked and wax-soaked gemstones,and the characteristic identification bands around 3035,3056,and 3095 cm^(-1)can be found in colloid-filled gemstones.Further,a stronger spectrum indicates a higher degree of filling.The spectral bands around 2235 cm^(-1)and 2609 cm^(-1)are the identification characteristics of gems filled with lead glass.The organic-material-coated gemstones can be directly identified using an infrared reflection method.