It is a custom in western countries to wear engagement ring on the middle finger of left hand. You can not imagine any engagement function without a ring. That is why the finger is called Engagement Ring Finger. There are different narrations giving reasons for this particular tradition. In ancient times Romans believed that the middle finger of left hand is connected to the heart with a direct nerve. Since heart is the place where love is born, the nerve is called ‘vena amoris' meaning nerve of love. Even today heart is a symbol of ever lasting love. The most important thing that leads to an engagement ring is nothing but love. Pure love prompts a commitment to marriage. In order to keep that love intact and ever increasing engagement ring is worn on the third finger of left hand. Some other sources say that in old days Engagement Ring Finger is believed to have some magical properties, so it has the honor of wearing ring. 
To prove his future wife that he is wealthy and that he can look after her well, a man bestows an engagement ring to the proposed bride. The value of the engagement ring depends upon the financial status of the bridegroom. Usually engagement rings become wedding rings after the marriage. Engagement ring or wedding ring also makes sure that the bride has some kind of financial insurance in case some unforeseen thing happens to her bridegroom. If she is widowed or divorced, she could make good use of her engagement ring to raise money. Now it is common that both bridegroom and bride wear engagement rings. 
Generally engagement rings are made of diamonds. Recently a new trend is coming up. Bridegrooms are also wearing engagement rings. These are called male engagement rings. People in some countries in Europe wear engagement rings on the fourth finger on left hand. The finger is called ring finger. Russians also wear engagement rings on ring fingers. Where as Indians wear engagement rings on ring finger of right hand. Indians consider right hand to be auspicious. 
Whatever finger may be the Engagement Ring Finger, wearing an engagement ring announces pure matrimonial intentions. It denotes unwavering love and everlasting loyalty. Almost in all matrimonial ceremonies of different cultures, engagement and engagement ring have vital role.

Before the sacred Wedding, couples who have agreed to tie their body and soul in an oath usually undergo an engagement. That is why engagement usually need same complicated preparation like wedding, since people often name it as a 'little wedding'.Once you propose a woman, she will be engaged with you automatically until the D-day of your marriage. The change of the status causes the change of the seriousness of both couple in the relationship also. After that, an engagement party can be held, or, if the couple are not used to it, they can skip it and hold the marriage directly.There is no fixed rule of how the engagement should be. You can make the party or ceremony private, or announce it in the newspaper the day after only to let people know that you have engaged with this woman, and therefore, that woman is not available for anyone anymore.Usually, engagement needs ring. Yes, just like in the movies, where the men bow on their knees and ask the women politely whether the women want to accept them as their husband for the rest of the life. The man will show the ring so that the woman knows that the man is serious with her, and that means so she is.

Then, the next question will pop up, where do you put the engagement ring? Where is the engagement ring finger? Will the man wear engagement ring also? What kind of engagement ring to buy and why is that so?I will help you finding out the answers to the questions one by one.Engagement ring is usually made of diamonds. Of course, it is not a must. But the engagement ring itself symbolizes the financial insurance that the groom has. In case that there is something happens on the middle of their way to marriage, the bride is allowed to sell the ring.Different culture means different understanding in the engagement ring finger. People in most countries in Europe and Russians believe that the engagement ring finger is located in the left hand, meanwhile Indian wear it on the right hand.The engagement ring symbolizes the agreement to get married, so it becomes common to give ring to the brides once after they give a 'yes' answer to the proposal.The fourth finger on the left hand is chosen as engagement ring finger because it is believed as the vein of love because it directly connected with the heart. This makes reasons of why people tend to wear the engagement ring on the fourth finger.