gems, jade, jadeite, fei cui, treated jadeite, fei cui, dyed jadeite, fei cui, lavender jadeite, fei cui

To explore the identification characteristics of purple jadeite treated with bleaching, filling, and dyeing, gem microscope, refractometer, UV-Vis-NIR spectrophotometer, XRF spectrometer, DiamondView, FTIR, and Raman spectrometer were used. The results showed that the internal structure of the purple jadeite samples treated with bleaching, filling, and dyeing was destroyed, and epoxy resin was detected by infrared spectrometer and Raman spectrometer. A strong Raman peak at 1596 cm⁻¹ could be the characteristic peak of dyes. Luminescent images showed the characteristic blue-violet fluorescence of the polymers formed by epoxy resin and organic dyes. The UV-Vis spectra of the treated purple jadeite samples showed an absorption band of 200–350 nm, an absorption peak at 409 nm, and an absorption band near 569 nm. In contrast, the internal structure of jadeite stained by purple polishing powder was not damaged, and the purple color appeared only on the surface since the powder particles remained superficially. The luminescent images showed pinkish-purple fluorescence, caused by the purple polishing powder. The UV-Vis spectra showed a strong central absorption band at 558 nm and a weak central absorption band at 611 nm, which differ from those of natural purple jadeite.