Fig. 1. Photographs of experimental samples

Fig. 2. Inclusion forms of natural Hongjiaohua crystals. (a) Moss form; (b) film form; (c) nodular form; (d) speckled form; (e) cloudy form; (f) gauzy form

Fig. 3. Inclusion forms of dyed Hongjiaohua crystals. (a) Colloidal contraction form; (b) condensation cracking of organic matter; (c) precipitation of granular color agent

Fig. 4. Ultraviolet-visible diffuse reflectance spectra of samples

Fig. 5. First derivatives of diffuse reflection spectra for natural Hongjiaohua crystal samples

Fig. 6. Photoluminescence spectra of dyed and natural Hongjiaohua crystal samples at the 405 nm excitation light source

Fig. 7. Raman spectra of exposed inclusions in natural Hongjiaohua crystal samples. (a) N-7; (b) N-5; (c) N-3