and Trump has better odds being our next 3 presidents than I do getting married but I'll say this: No way in hell would I buy a woman a diamond engagement ring. Even without the ethical quandaries (blood diamonds anyone?) I'd still feel like a chump. I remember growing up thinking a diamond engagement ring was a 1000 year old tradition and finding out it was all made up in the 20s by marketing execs to sell diamonds.
Have you ever thought of it from her point of view? Think about what she is giving up for you. She is giving up looking for other mates. She is giving up her name. She is giving up a lot of things for love. She is choosing you over her friends. That is not to say that she would not still see her friends once in a while but when you get married, you are both supposed to make each other a priorty over your old "buddies". A diamond engagement ring is a symbol of your commitment level to the relationship.
I used to be a jaded nerd like you. Do you spend money on buying cars that depreciate in value, cannot love you back and you eventually have to replace? Do you spend thousands of dollars on technology that depreciate in value, cannot love you back and eventually breakdown or become obsolete?
How about thinking about showing your love and appreciation for the woman in your life with flowers once in a while and a diamond ring? Trust me, once you find that girl you will want to put a ring on it sooner rather than later.