Is it permissible to exclude a gift of gold given to the mother from the inheritance in order to reclaim it?

If the mother takes possession of the gifted gold, it becomes her property, and it is not permissible to reclaim it. The gold becomes the property of the heirs after her death. However, if the mother did not take possession of the gold before her death, then it does not transfer to her ownership and remains the property of the giver.