There used to be a theory that a man should spend three month's salary on an engagement ring for his fiance. So if you were to make $2,000 each month, then $6000 is what you should spend on an engagement ring. Nowadays, that theory is not necessarily adhered to any longer.When looking at how much to spend on an engagement ring you need to look at how much you can really afford. Are you able to finance the ring? Do you want to make monthly payments are do you want to pay the ring off all at once? These things will all factor into how much you should spend on your engagement ring.My advice is to first go window shopping for engagement rings. Take a look at what you would like to buy for your fiance-to-be and then start saving for that ring or you can decide to finance the ring if you can aff