Hello! I hope your problem can be solved. Please contact Qu Yan, Director of Jewelry Department of Yantai Product Quality Supervision and Inspection Institute for jewelry and jade appraisal. Address: Floor 2, Building 5, Quality Inspection Institute, Xinyuan Road 17, lai shan, Yantai. Tel: 6920237 (This is the phone number in 2008. I don't know if it is now, but it should be, because it is all owned by the government. This is official, and the insurance factor should be higher. I wish you happiness!