When I met Tom I told him that if we got married I did not want a diamond engagement ring (I know.. crazy right?) Luckily when we got engaged (a few months later!!) Tom decided that what I meant was "I would probably love a diamond ring, thanks very much!"
Tom chose the stones for this ring and then designed the ring himself and had it made. He did this all without me knowing a thing, so that when he proposed it was a complete surprise (the proposal and the ring).