The most compelling reason why women should know their cubic zirconia from their diamond is that there are some guys who are willing to go the easy way out by forgetting to buy diamond rings on important events. You cannot substitute real diamond with zirconia. Even a small diamond speck appeals more than a massive cubic zirconia. The differences are hard to determine if you have an untrained eye and you do not know these qualities yet. You have to learn and understand these differences. It is not that cubic zirconia is not good. Nowadays, cheap is the best way to go with fashion jewelry but if someone is willing to cheat their way to engagement proposals, then there is a problem.