My one friend brought a Moissanite Engagement Ring and another one is having a Diamond. Both are telling me the pros and cons like Diamond is first in hardness scale, Moissanite gives much better brilliance, and Fire then moissanite. Moissanites are affordable and all. So now I am confused about choosing an Engagement Ring. Though it is not for me it is for my brother's wife but as I am an older brother so it is my duty to let them know what will be best for them a Moissanite or a Diamond Engagement Ring.