The ruling on exchanging used Gold for new Gold, like for like, while taking a Fee for Craftsmanship

Question :

What is the ruling concerning many of the people who have gold shops who deal with buying used gold (called Al-Kasr), and they take it to a gold merchant and exchange it for new gold that is specially crafted and that matches the weight of the old gold exactly? Then they take a fee for the craftsmanship of the new gold.

Answer:

It is confirmed from the Prophet that he said:
"Gold for gold, silver for silver, wheat for wheat, dates for dates, barley for barley, salt for salt, like for like, equal for equal, hand to hand (i.e., paid on the spot)."

It is also confirmed from him that he said:
"Whoever increases or seeks an increase, then indeed he has committed a Riba transaction."

It is also confirmed from him that he was given some good dates, so he asked about them. The people said, "We would take a Sa of this for two Sa's (of bad dates) and two Sa's for three Sa's." So, the Prophet commanded that the sale be canceled and he said:
"This is Riba, exactly."

Then he directed them to sell the lower quality dates for cash, and then to use that cash to buy good dates.

From these Hadiths you can tell that what the questioner mentioned of exchanging gold for gold while adding a fee for the craftsmanship done to one of them is a forbidden matter. It is not permissible and it is included in the Riba transactions that the Prophet prohibited. The safe method in this is that the used gold be sold for a price without any secret understanding or agreement. Then, after its owner takes the money, he buys the new thing. It is better that he search for the new thing in another place and if he does not find it he may return to the person to whom he sold the gold and buy with the cash. If the person increases the price, there is no harm in that. The important thing is that there is no trading of gold with gold while paying some difference, even if that is due to some special craftsmanship work. This is if the merchant is a merchant only for sale. However, if the merchant is also a goldsmith, then the buyer can say, "Take this gold and make if for me how I want it to be fashioned, and I will give you the cost for the work when the work is finished," there is no harm in that.

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