The natural emery producing areas in China are especially represented by Inner Mongolia, Lianyungang, Jiangsu and Rizhao, Shandong. The natural emery in Inner Mongolia is hard, but it is mainly washed by wind, with a large dust content, which affects the cutting speed. In addition, most of them are produced in small workshops and live inland, so the transportation cost is very high. Emery in Lianyungang, Jiangsu Province has always been the main producing area of natural emery in China, with bright color and average hardness. Most of them are produced by local small workshops in open-pit mines, so the cost is low and cheap, the quality control is not strict, there are often various impurities, and the water jet is often blocked. At the end of 20 1 1, Lianyungang government closed local mines and prohibited anyone from mining at will, resulting in a very high supply of natural emery in China. Natural emery in Rizhao, Shandong Province is a deeply buried mine with deep red color and high hardness. Since 20 1 1, it has been sold in the domestic market, so it is a little-known producing area with large supply, stable quality and convenient land and sea transportation, and will be the main producing area of natural emery in China in the next few years.