Is it permissible for the sister who lent gold to take back different gold that varies in weight after her lent gold was stolen?

The damaged borrowed item, if not transgressed upon, must be guaranteed with a similar item if possible; otherwise, with its monetary value, because craftsmanship affects its value and makes the value more precise. The sister who lent the item must return to the borrower what she took from her in gold and take from her the monetary value of what she lent her.