Selling used gold as new
Question

                What is the ruling on some owners of gold shops who buy clean used gold then offer it for sale at the price of new gold?

 Is such a thing permissible? Or should they inform the purchaser that it is used? Or do they not have to do that, since some purchasers do not ask whether it is new or not?.
Praise be to Allah.
    He should be sincere and want for his brother what he wants 
    for himself. Of course, if a person sells you something that has been 
    lightly used and has not been affected by use, and he sells it to you as 
    new, that is regarded as cheating and deception on his part. If you do not 
    accept to be treated in this manner by people, then how can you justify 
    doing it to other people? 

    Based on this, it is not permissible to do such things, 
    unless he explains to the purchaser and says to him: “This is lightly used” 
    or some such.