She
      gave him gold to melt it down and make jewellery
Question

                I
      have some old gold, which I took to the jeweller to have some new
      bracelets made. He said that he would melt it down and make it into
      something new, and that he would charge only for the work, i.e., his
      labour. Note that when old gold is melted down it loses approximately 2-3
      grams, so the new bracelets would weigh less than the gold which I gave to
      him. Please advise me, may Allaah reward you.
Praise be to Allah.If
      the jeweller is going to make your gold into jewellery, as you have asked
      him to, and then take a fee for his work, there is nothing wrong with
      that. But if he is going to make the jewellery from gold that is not
      yours, and he will take your gold as payment in addition to his fee, this
      is not permissible, because when gold is sold in exchange for gold, the
      amounts must be equal, and the transaction must be completed in one
      sitting. 
And
      Allaah is the Source of strength. May Allaah bless our Prophet Muhammad
      and his family and companions, and grant them peace.