Is it mandatory to have diamonds on your engagement rings? Can't any other stone replace the diamonds? I don't believe that diamonds are mandatory on engagement rings. One can have any gemstone of her liking on the ring. But i do prefer diamonds to any other stone because diamonds symbolise an unbreakable bond and nothing can convey the message of togetherness for an entire lifetime better than the diamonds. It is not the size of the diamond that matters to me but it is the promise that one makes through a diamond engagement ring that is significant! What do you think about this? Would you want a fancy engagement ring with some other gemstones or would you want to have diamond on it?