Question: This person asks about wearing a ring; i.e., at the time of the proposal for marriage.
Answer: It is not permissible for you. This is blind following of the disbelievers. It was not known amongst the people of al-Islaam. It has only come from the disbelievers. It has only come from the disbelievers. So it is not permissible for you to do that. They believe that when you put it on her then the marital life has commenced between the two of you; this is it origin. And it is based upon their Trinitarian belief. They pass it over the fingers then they put it in its place. So the Muslim is to distance himself from imitation of the disbelievers. There has already come with us yesterday, or before yesterday (the Hadeeth):
مَنْ تَشَبَّهَ بِقَوْمٍ فَهُوَ مِنْهُمْ
He who imitates a people then he is from them.
Shaykh Muhammad ibn Haadee al-Madkhalee (hafidhahullaah)
Translated by: Raha ibn Donald Batts (Masjid Tawheed wa Sunnah)
Note: In the Eastern Orthodox Service of Betrothal, the Priest makes the Sign of the Cross with rings over the bridegroom’s head while saying three times “The servant of God (Groom) is betrothed to the handmaid of God (Bride), in the Name of the Father, and of the Son, and of the Holy Spirit. Amen”. This is then followed by another three times over the bride’s head with the names reversed, after which the rings are exchanged three times (either by the priest or by the best man). The Priest asks God “to bless this putting on of rings with a heavenly blessing and that an Angel of the Lord will go before these Your servants, all the days of their life.” In Eastern Orthodox tradition the wedding ring is worn on the right hand rather than the left. (Source: https://en.wikipedia.org/wiki/Wedding_ring)
During the yester years in medieval England, bridegroom would slide the ring part-way up his bride’s thumb, index and middle finger, saying “In the name of the father, the son, and the holy ghost” as he passed each one. He then put the ring on the next available finger i.e. third finger of left hand. It was in 1500s that the practice was finally formalized, when Henry VIII’s son wrote the book ‘The Book of Common Prayer’. The book spelt English modern Protestant wedding vows and verdict on the finger on which the wedding rings should be worn. (Source: http://lifestyle.iloveindia.com/lounge/history-of-wedding-ring-3552.html)