采用红外反射光谱技术对珠宝市场上的六种塑料仿宝石饰品进行了测试研究, 并将其与相应被仿宝石(粉珊瑚、象牙、红纹石、绿玉髓、水晶和合成黑欧泊)进行了对比分析。结果表明, 由于物质成分及分子结构的不同, 塑料仿制品与真实宝石的红外图谱差异显著。该项技术不仅能够依据红外谱峰的数量、峰位、形态、强度以及谱带分裂状态等特征对塑料进行鉴别及归类, 而且还是一种快速、准确、无损的塑料仿制品检测手段。尤其是针对外观及基本物性特征与真实宝石相差无几的塑料高仿制品(如仿合成黑欧泊), 常规技术手段无法鉴别, 但红外反射光谱技术则可发挥无可替代的作用。

Infrared reflectance spectroscopy was used to test six kinds of plastic imitation materials for gems in jewelry market. Those materials were compared with the corresponding six real gem materials including pink coral, ivory, rhodochrosite, green chalcedony, rock crystal and synthetic black opal. The results showed that the infrared spectra of plastic imitations were significantly different from those of real gemstones due to the differences in material composition and molecular structure. Infrared spectroscopy not only could identify and classify plastics according to the number, position, morphology, strength and spectral division of infrared spectral peaks, but also was a quick, accurate and non-destructive means for testing plastic imitations. In particular, for the identification of those high imitation products with appearance and basic physical characteristics quite similar to their corresponding real stones (such as imitations for synthetic black opal), conventional identification means were not effective, but infrared reflectance spectroscopy could play an irreplaceable role.