The ruling on giving raw Gold to the Jeweler to have it changed into Jewelry
Question :
A man gave an ingot of gold to a jeweler and said to him, "Make this ingot into a bracelet for me." And he said, "Add copper to the ingot that will change the gold from 24 carrots to 21 carrots and I will give you the weight of the copper and the gold for an intricate bracelet." Then, the jeweler took the price of the work. So, is this permissible or not?
Answer:
If he gave him the gold by weight to change it into jewelry or something else, and the jeweler returns it to him, there is no harm in that, if Allâh wills, if it is done for a fee that they agree on. However, if he takes the ingot and gives him another gold bracelet, then that is not permissible, except under the condition that both of them are equal in weight in the amount of gold and copper. And there is no harm in taking a fee in compensation for workmanship.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 3 Page 366