What is the ruling on buying a silver ring from the internet, and is repentance, returning it, or donating its price obligatory after learning of its impermissibility?

It is not permissible to buy silver or gold with banknotes unless the قبض (possession) takes place immediately at the contract session, either actually or constructively. This applies even if it is crafted jewelry. This also includes online purchases due to the delay in قبض. Some scholars permit the sale of crafted gold and silver of the same type without requiring exact equivalence, considering the excess in exchange for the craftsmanship. If the transaction has already occurred, there is no impediment to adopting this view, while refraining from similar actions in the future to avoid controversy.