Is zakat al-khums obligatory on commemorative, artistic, and archaeological artifacts and inherited items, considering them treasures owned by individuals, knowing that this would achieve social justice and ease the reckoning for the deceased?

The obligatory Zakat (definition) on currency and other assets is a quarter of a tenth (2.5%), unless the wealth is rikāz (a pre-Islamic buried treasure), in which case one-fifth is obligatory. Wealth on which Zakat is paid is not considered kanz (hoarded treasure), and neither the one-fifth nor any other amount is due on it during its owner's lifetime or after their death, except through a will within the limits of one-third. The rule is that any wealth on which Zakat has been paid is not kanz, and any wealth on which Zakat has not been paid is kanz for which its owner will be punished, as Umar ibn al-Khaṭṭāb, may Allah be pleased with him, said. Permissible personal possessions are not subject to Zakat or one-fifth, unless they are currency.