Using modern analytical methods, the chemical composition and UV-visible spectrum of various color-changing gemstones such as marble, synthetic stone, color-changing garnet, synthetic and natural color-changing sapphire were analyzed, and the cause of color-changing effect was discussed by crystal field theory. Focus on the role of C and V in the color change effect in various color-changing gemstones.
The color change effect is the result of a combination of the nature of the source and the selective absorption of the chromogenic ions in the gemstone. The gemstone's absorption of r red and green light reaches a basic balance to produce distinctly different colors under daylight and incandescent light.
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