Jewelery in theory because of the 21% tax on it at home for a start! But the reality of bringing it from A to B would probably involve paying duty.
In reality people like to pick their own but I have gotten a few little pieces for my sisters if they send me a picture as they trust me.
But as a business it sounds rather shady!
Hard to transport but I just got 250ml of morroccan argon oil for 75aed and a few American friends back home said they was very cheap?! But the shisha pipes seem to be something everyone brings back