Minh co mua o day 1 vien kim cuong nhung khi kiem tra hoa don mat sau co thay ghi khi thu lai,doi gia tri lon hon thi PNJ tinh theo gia tri tren to hoa don la?tai sao kg thu va doi lai theo gia thi truong tai thoi diem thu,doi.neu nhu vay sau nay dong tien mat gia thi viec mua kim cuong cung tro ve so khong sao?