Dear Abdul,
look at the comment of Molten Metal. Just follow that. you must(without fail) enter the quantity of jewellery in black and white with customs of your departure port. it will take almost 2-3 hours. so at least this time, dont be the last person on the check in queue.if you didn't follow it, you will be in trouble while you are taking this metal back. BUT, why can't you get one safety locker in any bank and keep it there..??