Why does giving an engagement ring matter? Giving something of value when someone gets married is nothing new. In many other places in the world a dowry is still given. People have always given something of value to solidify a marriage. But WHY? Well because you put your money where your mouth is. Giving up something of value proves you are committed. Diamonds are not logical. Think about it. A young man takes the most money he probably spend on anything and buys a rock and then gives it away. It has no function other than to say 'I love you'. And that's the point. It does nothing for him. It is the most pure symbol of love we have.