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On the basis of uniform color space CIE 1976 L*a*b*, using Munsell color system as a contrast system, this paper discusses the influence of different achromatic backgrounds on tourmaline green through quantitative analysis of color indexes such as lightness, chroma and hue of green tourmaline, and draws the following conclusion: in the process of achromatic background lightness transformation, the lightness and chroma of green tourmaline are highly sensitive to it and have obvious changes along with it, and the two also have high synchronization; However, the hue has not changed much. At the same time, the green tourmaline itself has higher lightness and chroma, which can make the lightness of the achromatic background more effectively converted into the visual lightness and saturation of the tourmaline, but the green tourmaline with too high or too low lightness and chroma is hardly affected by the lightness of the achromatic background. This proves that the non-color background is suitable for most tourmaline green quality evaluation.