What is Dinar?

What is Dinar?
Basically, Dinar is a gold coin.
The World Islamic Trading Organisation following the standard of caliph Umar Ibn al-Khattab, established the following standard:
DINAR Weight: 4.25 grams
Alloy: 22 carats (0.916) Gold

According to Islamic Law...

The Islamic gold dinar (sometimes referred as Islamic dinar or Gold dinar) is a bullion gold coin made from 4.25 grams of 22-carat gold with historical Islamic significance.

Gold dinar may also refer to various historic gold coins denominated in dinars.

The Islamic Dirham is a specific weight of pure silver equivalent to 3.0 grams.

Umar Ibn al-Khattab established the known standard relationship between them based on their weights: "7 dinars must be equivalent to 10 dirhams."

"The Revelation undertook to mention them and attached many judgements to them, for example zakat, marriage, and hudud, etc., therefore within the Revelation they have to have a reality and specific measure for assessment [of zakat, etc.] upon which its judgements may be based rather than on the non-shari'i [other coins].

Know that there is consensus [ijma] since the beginning of Islam and the age of the Companions and the Followers that the dirham of the shari'ah is that of which ten weigh seven mithqals [weight of the dinar] of gold. . . The weight of a mithqal of gold is seventy-two grains of barley, so that the dirham which is seven-tenths of it is fifty and two-fifths grains. All these measurements are firmly established by consensus." Ibn Khaldun, Al-Muqaddimah


Sources : "http://www.publicdinar.com/content/view/48/53/lang,english/"