What is the value of the old dinar in the era of the Messenger of Allah, peace and blessings be upon him, in Saudi Riyals?

The Dinar is a piece of gold weighing one Mithqal, which today equals 4.25 grams of gold. It is the standard for determining various Sharia rights, such as the value of Zakat, blood money (Diyya), the dowry (Sadaq), the threshold for theft (Nisab al-Sariqa), and the expiation for intercourse with a menstruating woman.