The Dowry. It is permissible for the dowry to be teaching Quran, a ring of iron or anything else, a small or large amount, And it is recommended for it to be Five Hundred Dirham Sahih Muslim 1427 b
Translation
Anas b. Malik (Allah be pleasedwith him) reported that 'Abd al-Rahman b. 'Auf (Allah be pleased with him) married during the lifetime of Allah's Messenger (ﷺ) for a nawat weight of gold and the messenger of Allah (ﷺ) said to him
Give a feast even with a sheep.