A series of heat-treatment experiments of zircons from Changle in Shandong Province were oonducted at different temperatures in oxidizing and reducing atmosphere. The colors and their variations were studied by UV-NIR spectrometer. The formation mechanism of the zircon colors was discussed on the basis of the experiments. It is found that the color of the zircons after heat-treatment changed into colorless, yellow or orange in oxidizing atmosphere and colorless in reducing atmosphere. All the samples began to fade significantly at 400℃. The results also show that the red and redish brown colors of zircons are attributed to the color center and Fe3+ is responsible for the yellow coloration of zircons. Only a low temperature can make zircon change into perfect colorless, and hence the color enhancement of zircon has tremendous commercial value.%对山东昌乐锆石进行了一系列不同温度、不同气氛的热处理实验,并通过紫外-分光吸收光谱对锆石的颜色及其变化进行分析,探讨了昌乐锆石的呈色机理.结果显示,锆石在氧化条件下变成无色、黄色或橙色,在还原条件下产生无色,且所有样品都在400℃时颜色发生明显改变.研究表明,锆石的红色、红褐色是由空穴色心所致,锆石的黄色是由于样品中Fe3+造成的染色；锆石无色效果的改色所需温度较低,效果较好,具有巨大的商业价值.
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