What is the minimum dowry and its current value compared to the dowries of the Mothers of the Believers?

The minimum mahr (dowry) was clarified in the hadith (definition) of Sahl ibn Sa'd al-Sa'idi, which stated that the mahr could be something very simple, like an iron ring or teaching a surah (definition) from the Qur'an. This is the view held by Imam al-Shafi'i and the majority of scholars. As for the mahr of the Mothers of the Believers, the dowry given by the Prophet, peace and blessings be upon him, to his wives was twelve uqiyyahs and a nashsh, which is equivalent to five hundred dirhams. The weight of a dirham is estimated at 2.975 grams, thus the mahr of the Messenger of Allah's wives was 1487.5 grams of silver.