Observing the same gemstone material under the same light source and different backgrounds, the color observed by the naked eye is different. For transparent gemstones, the background color passes through the gemstone to affect the color of gemstone we can see, which can be quantitatively characterized by a hand-held colorimeter. For opaque gemstones, the background cannot pass through the gemstone, and whether the method of photographing and reading color by software can quantify the effect? Or are there any way to characterize the color change of the opaque gemstone added to the background?