The two most authoritative appraisal institutions in Beijing are the National Jewelry Quality Supervision and Inspection Center under the former Ministry of Geology and Mineral Resources and the Beijing Gaode Jewelry Appraisal Institute under the former Ministry of Foreign Trade and Economic Cooperation. One thing to be reminded is that there are many certificates issued by businesses that are not authorized by the state, and such certificates may be discounted in accuracy and authority. According to the document No.001of China Gemstone Association in 2004, the nationwide sampling results show that at least 19 appraisal institutions have some problems such as deliberately raising the diamond grade and identifying quartzite as jadeite, and some appraisal institutions even have a large number of unqualified tests. These problems are not all limited to the level of detection, but artificial cosmetic surgery for some interests, and consumers should pay special attention.