for gold received in hand, this is permissible. But if worked silver is sold for a greater quantity of silver on account of the workmanship, this is not permissible.

The third category is where both elements are sought in their own right, as when weapons bear a substantial amount of gold or silver. If the quantity of that metal is known and the item is sold for a greater quantity of the same metal, there is a well-known disagreement concerning this. The more evident view is that it is permissible. If worked, gilded silver is sold for gold, or for debased gold, this is permissible. But if worked silver is sold for a greater quantity of silver, this is not permissible. And Allah knows best.

He—may Allah have mercy on him—said:

Section

As for exchanging nuqra silver dirhams, whose silver content is approximately two-thirds, for black dirhams, whose silver content is approximately one-quarter, or somewhat less or more, this relates to the question known as “a mudd of ajwa dates.” In essence, this concerns selling a commodity subject to the rules of ribā, together with something else, in exchange for a commodity of the same kind as the former. People’s positions on this range between the two extremes of prohibition and permission, with others adopting an intermediate position.