Exchanging gold for gold
Q: I had a gold chain which I traded in to the goldsmith for a new chain which he is going to make for me. The new chain might be a bit longer than my original one which I traded in, therefore, because the weight of the new chain is more, I will have to pay him a little extra money.
At the moment, my original chain is with him, and I will only take my new chain from him when it is ready. Is it permissible for us to do the transaction in this way?