Cho e hoi hom 23/11/14e co mua mot chiec nhan kim cuong 4,2ly nhung k co giay kiem dinh cua cty ma chi co hoa don,vi theo loi nhan vien noi la kim cuong fai tren 4,5 ly moj co giay kiem dinh.Xin cho e biet neu k co giay kiem dinh thi sau nay e uon ban hoac doi thi co thiet thoi gi cho e k ah Xin cam on