Previous geological work has found thousands of diamonds from Baiyan of Yimeng Mountain area, Shandong Province. These diamonds have plenty of green and green spots in crystals. The particles are fine, the surface has dark green or brown spots, and the color is uneven, exhibiting green, green, blue green, brown green, yellow green, gray green, or black green colors; the crystal is not complete, with light or micro wear. The green diamonds from the Shangnihecun conglomerate and the Quaternary fluvial sandstone and conglomerate of Zaozhuang City show a color pattern changing from green to brown. During the cutting and grinding process and the processing of green diamond with heating, the green color does not disappear, but the diamond changes in purity and brightness, or even shows new additional color or the disappearance of additional color. These changes are of gemological significance.